A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-990914 advisory.

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly     return a success status even when key derivation fails. This results in uninitialized cryptographic key     buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality,     integrity, and availability.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the libssh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly     return a success status even when key derivation fails. This results in uninitialized cryptographic key     buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality,     integrity, and availability.(CVE-2025-5372)

    A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID     during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL     pointer dereference. This issue can cause the client or server to crash.(CVE-2025-8114)

    There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large     input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can     experience an integer overflow leading to a memory under allocation, when that happens it's possible that     the program perform out of bounds write leading to a heap corruption.
    This issue affects only 32-bits builds of libssh.(CVE-2025-4877)

    A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in     the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename     doesn't exist and may lead to possible signing failures or heap corruption.(CVE-2025-4878)

Tenable has extracted the preceding description block directly from the EulerOS libssh security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libssh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large     input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can     experience an integer overflow leading to a memory under allocation, when that happens it's possible that     the program perform out of bounds write leading to a heap corruption.
    This issue affects only 32-bits builds of libssh.(CVE-2025-4877)

    A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in     the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename     doesn't exist and may lead to possible signing failures or heap corruption.(CVE-2025-4878)

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly     return a success status even when key derivation fails. This results in uninitialized cryptographic key     buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality,     integrity, and availability.(CVE-2025-5372)

    A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID     during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL     pointer dereference. This issue can cause the client or server to crash.(CVE-2025-8114)

Tenable has extracted the preceding description block directly from the EulerOS libssh security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libssh package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly     return a success status even when key derivation fails. This results in uninitialized cryptographic key     buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality,     integrity, and availability.(CVE-2025-5372)

    A flaw was found in the libssh library. An out-of-bounds read can be triggered in the sftp_handle function     due to an incorrect comparison check that permits the function to access memory beyond the valid handle     list and to return an invalid pointer, which is used in further processing. This vulnerability allows an     authenticated remote attacker to potentially read unintended memory regions, exposing sensitive     information or affect service behavior.(CVE-2025-5318)

Tenable has extracted the preceding description block directly from the EulerOS libssh security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-987418 advisory.

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly     return a success status even when key derivation fails. This results in uninitialized cryptographic key     buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality,     integrity, and availability.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the libssh package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function may mistakenly return     a success status even when key derivation fails. This results in uninitialized cryptographic key buffers     being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity,     and availability. (CVE-2025-5372)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-18e8506d3a advisory.

    New upstream release with security fixes for CVE-2025-4877, CVE-2025-4878, CVE-2025-5987, CVE-2025-5318,     CVE-2025-5351, CVE-2025-5372, CVE-2025-5449

    ----

    Automatic update for libssh-0.11.0-1.fc41.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libssh installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-5372 advisory.

  - A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function May mistakenly return     a success status even when key derivation fails. This results in uninitialized cryptographic key buffers     being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity,     and availability. (CVE-2025-5372)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of libssh installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-5372 advisory.

  - A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the     ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values     where OpenSSL uses 0 to indicate failure and libssh uses 0 for successthe function May mistakenly return     a success status even when key derivation fails. This results in uninitialized cryptographic key buffers     being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity,     and availability. (CVE-2025-5372)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02281-1 advisory.

    - CVE-2025-4877: Fixed write beyond bounds in binary to base64 conversion functions (bsc#1245309).
    - CVE-2025-4878: Fixed use of uninitialized variable in privatekey_from_file() (bsc#1245310).
    - CVE-2025-5318: Fixed likely read beyond bounds in sftp server handle management (bsc#1245311).
    - CVE-2025-5372: Fixed ssh_kdf() returns a success code on certain failures (bsc#1245314).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02279-1 advisory.

    - CVE-2025-4877: Fixed write beyond bounds in binary to base64 conversion functions (bsc#1245309).
    - CVE-2025-4878: Fixed use of uninitialized variable in privatekey_from_file() (bsc#1245310).
    - CVE-2025-5318: Fixed likely read beyond bounds in sftp server handle management (bsc#1245311).
    - CVE-2025-5372: Fixed ssh_kdf() returns a success code on certain failures (bsc#1245314).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02278-1 advisory.

    - CVE-2025-4877: Fixed write beyond bounds in binary to base64 conversion functions (bsc#1245309).
    - CVE-2025-4878: Fixed use of uninitialized variable in privatekey_from_file() (bsc#1245310).
    - CVE-2025-5318: Fixed likely read beyond bounds in sftp server handle management (bsc#1245311).
    - CVE-2025-5372: Fixed ssh_kdf() returns a success code on certain failures (bsc#1245314).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7619-1 advisory.

    Ronald Crane discovered that libssh incorrectly handled certain base64 conversions. An attacker could use     this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2025-4877)

    Ronald Crane discovered that libssh incorrectly handled the privatekey_from_file() function. An attacker     could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2025-4878)

    Ronald Crane discovered that libssh incorrectly handled certain memory operations in the sftp server. An     attacker could possibly use this issue to cause libssh to crash, resulting in a denial of service.
    (CVE-2025-5318, CVE-2025-5449)

    Ronald Crane discovered that libssh incorrectly handled exporting keys. An attacker could possibly use     this issue to cause libssh to crash, resulting in a denial of service. This issue only affected Ubuntu     24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-5351)

    Ronald Crane discovered that libssh incorrectly handled the ssh_kdf() function. An attacker could use this     issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2025-5372)

    Ronald Crane discovered that libssh incorrectly handled the ChaCha20 cipher. An attacker could possibly     use this issue to cause libssh to use partially initialized cypher content. This issue only affected     Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-5987)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02229-1 advisory.

    - CVE-2025-5318: Fixed likely read beyond bounds in sftp server handle management (bsc#1245311).
    - CVE-2025-4877: Fixed write beyond bounds in binary to base64 conversion functions (bsc#1245309).
    - CVE-2025-4878: Fixed use of uninitialized variable in privatekey_from_file() (bsc#1245310).
    - CVE-2025-5372: Fixed cases where ssh_kdf() returns a success code on certain failures (bsc#1245314).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libssh installed on the remote host is prior to 0.11.2. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-175-01 advisory.

    New libssh packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libssh security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
275430	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libssh (UTSA-2025-990914)	Nessus	Unity Linux Local Security Checks	high
274927	EulerOS 2.0 SP12 : libssh (EulerOS-SA-2025-2332)	Nessus	Huawei Local Security Checks	high
274919	EulerOS 2.0 SP10 : libssh (EulerOS-SA-2025-2420)	Nessus	Huawei Local Security Checks	high
274867	EulerOS 2.0 SP12 : libssh (EulerOS-SA-2025-2363)	Nessus	Huawei Local Security Checks	high
274860	EulerOS 2.0 SP10 : libssh (EulerOS-SA-2025-2392)	Nessus	Huawei Local Security Checks	high
270066	EulerOS 2.0 SP11 : libssh (EulerOS-SA-2025-2233)	Nessus	Huawei Local Security Checks	high
270042	EulerOS 2.0 SP11 : libssh (EulerOS-SA-2025-2201)	Nessus	Huawei Local Security Checks	high
268859	Unity Linux 20.1070a Security Update: libssh (UTSA-2025-987418)	Nessus	Unity Linux Local Security Checks	high
260441	Photon OS 5.0: Libssh PHSA-2025-5.0-0597	Nessus	PhotonOS Local Security Checks	high
253441	Photon OS 4.0: Libssh PHSA-2025-4.0-0856	Nessus	PhotonOS Local Security Checks	high
251965	Linux Distros Unpatched Vulnerability : CVE-2025-5372	Nessus	Misc.	high
244363	Fedora 41 : libssh (2025-18e8506d3a)	Nessus	Fedora Local Security Checks	medium
242358	Azure Linux 3.0 Security Update: libssh (CVE-2025-5372)	Nessus	Azure Linux Local Security Checks	high
242354	CBL Mariner 2.0 Security Update: libssh (CVE-2025-5372)	Nessus	MarinerOS Local Security Checks	medium
242013	SUSE SLES12 Security Update : libssh (SUSE-SU-2025:02281-1)	Nessus	SuSE Local Security Checks	medium
241965	SUSE SLES15 Security Update : libssh (SUSE-SU-2025:02279-1)	Nessus	SuSE Local Security Checks	medium
241960	SUSE SLES15 Security Update : libssh (SUSE-SU-2025:02278-1)	Nessus	SuSE Local Security Checks	medium
241506	Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : libssh vulnerabilities (USN-7619-1)	Nessus	Ubuntu Local Security Checks	medium
241379	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libssh (SUSE-SU-2025:02229-1)	Nessus	SuSE Local Security Checks	medium
240488	Slackware Linux 15.0 / current libssh Multiple Vulnerabilities (SSA:2025-175-01)	Nessus	Slackware Local Security Checks	medium

Detections

Analytics

CVE-2025-5372

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

medium

high

medium

medium

medium

medium

medium

medium

medium