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

  - In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions     via the filename of . or an empty filename. The impact is modifying the permissions of the target     directory on the client side. (CVE-2018-20685)

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

The remote NewStart CGSL host, running version MAIN 6.06, has openssh packages installed that are affected by multiple vulnerabilities:

  - The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and     relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a     fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11     server, as demonstrated by lack of the SECURITY extension on this X11 server. (CVE-2016-1908)

  - Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service     (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors     that lead to a double-free. (CVE-2006-5051)

  - scp in OpenSSH 4.2p1 allows attackers to execute arbitrary commands via filenames that contain shell     metacharacters or spaces, which are expanded twice. (CVE-2006-0225)

  - sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a     denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not     properly handled by the CRC compensation attack detector. (CVE-2006-4924)

  - Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker     verification that authentication has been successful, which might allow attackers to bypass     authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging     vulnerabilities in the unprivileged process, which are not known to exist. (CVE-2006-5794)

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

The remote NewStart CGSL host, running version MAIN 6.06 (SP), has openssh packages installed that are affected by multiple vulnerabilities:

  - The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and     relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a     fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11     server, as demonstrated by lack of the SECURITY extension on this X11 server. (CVE-2016-1908)

  - Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service     (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors     that lead to a double-free. (CVE-2006-5051)

  - scp in OpenSSH 4.2p1 allows attackers to execute arbitrary commands via filenames that contain shell     metacharacters or spaces, which are expanded twice. (CVE-2006-0225)

  - sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a     denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not     properly handled by the CRC compensation attack detector. (CVE-2006-4924)

  - Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker     verification that authentication has been successful, which might allow attackers to bypass     authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging     vulnerabilities in the unprivileged process, which are not known to exist. (CVE-2006-5794)

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

Vulnerability in the Oracle Solaris component of Oracle Sun Systems Products Suite (subcomponent: SunSSH). The supported version that is affected is 10. Difficult to exploit vulnerability allows unauthenticated attacker with network access via SSH to compromise Oracle Solaris. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Solaris accessible data.

According to the version of the openssh packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

  - In OpenSSH 7.9, scp.c in the scp client allows remote     SSH servers to bypass intended access restrictions via     the filename of . or an empty filename. The impact is     modifying the permissions of the target directory on     the client side.i1/4^CVE-2018-20685i1/4%0

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-202007-53 (Dropbear: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Dropbear. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

An update of the openssh package has been released.

This update for openssh fixes the following issues :

Security issue fixed :

CVE-2018-20685: Fixed an issue where scp client allows remote SSH servers to bypass intended access restrictions (bsc#1121571)

CVE-2019-6109: Fixed an issue where the scp client would allow malicious remote SSH servers to manipulate terminal output via the object name, e.g. by inserting ANSI escape sequences (bsc#1121816)

CVE-2019-6110: Fixed an issue where the scp client would allow malicious remote SSH servers to manipulate stderr output, e.g. by inserting ANSI escape sequences (bsc#1121818)

CVE-2019-6111: Fixed an issue where the scp client would allow malicious remote SSH servers to execute directory traversal attacks and overwrite files (bsc#1121821)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2025-10789:04 advisory.

    * CVE-2018-20685: fix a vulnerability scp client where a malicious server     could bypass intended access restrictions and modify target directory     permissions via crafted filenames
    * CVE-2019-6109: fix scp client where a malicious server could manipulate   the     client's progress display output due to missing character encoding
    * CVE-2019-6111: fix scp client vulnerability that allowed a malicious   server     to overwrite arbitrary files in the client's target directory,   including     subdirectories, when performing transfers     CVE(s):
    CVE-2019-6109     An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a     malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client     output, e.g., by using ANSI control codes to hide additional files being transferred. This affects     refresh_progress_meter() in progressmeter.c.
    CVE-2018-20685     In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions     via the filename of . or an empty filename. The impact is modifying the permissions of the target     directory on the client side.
    CVE-2019-6111     An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the     server chooses which files/directories are sent to the client. However, the scp client only performs     cursory validation of the object name returned (only directory traversal attacks are prevented). A     malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client     target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as     well (for example, to overwrite the .ssh/authorized_keys file).

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-3702 advisory.

    [8.0p1-3 + 0.10.3-7]
    - Fix typos in manual pages (#1668325)
    - Use the upstream support for PKCS#8 PEM files alongside with the legacy PEM files (#1712436)
    - Unbreak ssh-keygen -A in FIPS mode (#1732424)
    - Add missing RSA certificate types to offered hostkey types in FIPS mode (#1732449)

    [8.0p1-2 + 0.10.3-7]
    - Allow specifying a pin-value in PKCS #11 URI in ssh-add (#1639698)
    - Whitelist another syscall variant for s390x cryptographic module (ibmca engine) (#1714915)

    [8.0p1-1 + 0.10.3-7]
    - New upstream release (#1691045)
    - Remove support for unused VendorPatchLevel configuration option
    - Fix kerberos cleanup procedures (#1683295)
    - Do not negotiate arbitrary primes with DH GEX in FIPS (#1685096)
    - Several GSSAPI key exchange improvements and sync with Debian
    - Allow to use labels in PKCS#11 URIs even if they do not match on private key (#1671262)
    - Do not fall back to sshd_net_t SELinux context (#1678695)
    - Use FIPS compliant high-level signature OpenSSL API and KDF
    - Mention crypto-policies in manual pages
    - Do not fail if non-FIPS approved algorithm is enabled in FIPS
    - Generate the PEM files in new PKCS#8 format without the need of MD5 (#1712436)

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

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

This update fixes CVE-2018-20685 (the first 'variant').

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2025:0541 advisory.

    Package updates are available for TencentOS Server 2 that fix the following vulnerabilities:

    CVE-2023-48795:
    An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a     malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client     output, e.g., by using ANSI control codes to hide additional files being transferred. This affects     refresh_progress_meter() in progressmeter.c.

    CVE-2023-51385:
    An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the     server chooses which files/directories are sent to the client. However, the scp client only performs     cursory validation of the object name returned (only directory traversal attacks are prevented). A     malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client     target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as     well (for example, to overwrite the .ssh/authorized_keys file).

    CVE-2019-6109:
    In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious     server (or Man-in-The-Middle attacker) can manipulate the client output, for example to use ANSI control     codes to hide additional files being transferred.

    CVE-2020-14145:
    In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions     via the filename of . or an empty filename. The impact is modifying the permissions of the target     directory on the client side.

    CVE-2019-6110:
    In ssh in OpenSSH before 9.6, OS command injection might occur if a user name or host name has shell     metacharacters, and this name is referenced by an expansion token in certain situations. For example, an     untrusted Git repository can have a submodule with shell metacharacters in a user name or host name.

    CVE-2019-6111:
    The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other     products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the     extension negotiation message), and a client and server may consequently end up with a connection for     which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because     the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and     mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of     ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and     (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API     before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80,     AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0,     Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15,     SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH     through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang     XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd     through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and     LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3,     Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server     before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the     mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh     crate before 0.40.2 for Rust.

    CVE-2020-15778:
    ** DISPUTED ** scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as     demonstrated by backtick characters in the destination argument. NOTE: the vendor reportedly has stated     that they intentionally omit validation of anomalous argument transfers because that could stand a     great chance of breaking existing workflows.

    CVE-2018-20685:
    The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in     the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts     (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and     8.6 are also affected.

Tenable has extracted the preceding description block directly from the Tencent Linux 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	Published	Updated	Severity
222159	Linux Distros Unpatched Vulnerability : CVE-2018-20685	Nessus	Misc.	3/4/2025	7/19/2026	medium
266250	NewStart CGSL MAIN 6.06 : openssh Multiple Vulnerabilities (NS-SA-2025-0210)	Nessus	NewStart CGSL Local Security Checks	9/30/2025	9/30/2025	critical
301236	NewStart CGSL MAIN 6.06 (SP) : openssh Multiple Vulnerabilities (NS-SA-2026-0003)	Nessus	NewStart CGSL Local Security Checks	3/6/2026	3/6/2026	critical
124075	Solaris 10 (sparc) : 148104-29	Nessus	Solaris Local Security Checks	4/16/2019	1/23/2020	medium
123720	EulerOS Virtualization 2.5.3 : openssh (EulerOS-SA-2019-1252)	Nessus	Huawei Local Security Checks	4/4/2019	6/5/2024	medium
139116	GLSA-202007-53 : Dropbear: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	7/30/2020	2/27/2024	medium
202795	Photon OS 3.0: Openssh PHSA-2019-3.0-0003	Nessus	PhotonOS Local Security Checks	7/22/2024	7/24/2024	medium
121306	SUSE SLES11 Security Update : openssh (SUSE-SU-2019:13931-1)	Nessus	SuSE Local Security Checks	1/22/2019	5/24/2022	medium
283017	MiracleLinux 7 : openssh-7.4p1-23.0.3.0.3.el7.AXS7 (AXSA:2025-10789:04)	Nessus	Miracle Linux Local Security Checks	1/13/2026	1/13/2026	medium
180726	Oracle Linux 8 : openssh (ELSA-2019-3702)	Nessus	Oracle Linux Local Security Checks	9/7/2023	10/22/2024	medium
121262	Fedora 28 : openssh (2019-9eb0ae6296)	Nessus	Fedora Local Security Checks	1/22/2019	6/26/2024	medium
247820	TencentOS Server 2: openssh (TSSA-2025:0541)	Nessus	Tencent Local Security Checks	8/11/2025	12/4/2025	medium

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