libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8463-1 advisory.

    It was discovered that LibVNCServer had a memory leak in the client cleanup function. An attacker could     possibly use this issue to cause LibVNCServer to consume memory, leading to a denial of service. This     issue only affected Ubuntu 22.04 LTS. (CVE-2020-29260)

    It was discovered that LibVNCServer did not properly validate bounds when handling UltraZip encoding     subrectangles. A remote attacker could possibly use this issue to obtain sensitive information or cause a     denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04.
    (CVE-2026-32853)

    It was discovered that LibVNCServer did not properly validate return values in the HTTP proxy handlers. A     remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of     service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04. (CVE-2026-32854)

    It was discovered that LibVNCServer did not properly handle Tight encoding gradient filter rectangles. A     remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2026-44988)

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 NewStart CGSL host, running version MAIN 7.02, has libvncserver packages installed that are affected by a vulnerability:

  - libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().
    (CVE-2020-29260)

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

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

  - libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().
    (CVE-2020-29260)

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().
    (CVE-2020-29260)

The version of libvncserver installed on the remote host is prior to 0.9.9-14. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2023-2170 advisory.

    libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().
    (CVE-2020-29260)

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

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 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:4330-1 advisory.

    - CVE-2020-29260: Fixed memory leakage via rfbClientCleanup() (bsc#1203106).

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

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:3990-1 advisory.

    - CVE-2020-29260: Fixed memory leakage via rfbClientCleanup() (bsc#1203106).

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

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:3540-1 advisory.

    - CVE-2020-29260: Fixed memory leakage via rfbClientCleanup() (bsc#1203106).

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

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

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3125 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3125-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                    Thorsten Alteholz     September 30, 2022                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libvncserver     Version        : 0.9.11+dfsg-1.3+deb10u5     CVE ID         : CVE-2020-25708 CVE-2020-29260


    Two issues have been found in libvncserver, a library to write one's own     VNC server.


    CVE-2020-25708

        Due to some missing checks, a divide by zero could happen, which could         result in a denial of service.

    CVE-2020-29260

        Due to a memory leak in function rfbClientCleanup() a remote attacker         might be able to cause a denial of service.



    For Debian 10 buster, these problems have been fixed in version     0.9.11+dfsg-1.3+deb10u5.

    We recommend that you upgrade your libvncserver packages.

    For the detailed security status of libvncserver please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libvncserver

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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	Type	Severity
322481	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : LibVNCServer vulnerabilities (USN-8463-1)	Nessus	Ubuntu Local Security Checks	Local	medium
242829	NewStart CGSL MAIN 7.02 : libvncserver Vulnerability (NS-SA-2025-0182)	Nessus	NewStart CGSL Local Security Checks	Local	high
223555	Linux Distros Unpatched Vulnerability : CVE-2020-29260	Nessus	Misc.	Local	high
405367	Alpine: multiple libvncserver packages: security update to 0.9.13-r5	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
405367	Alpine: multiple libvncserver packages: security update to 0.9.13-r5	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
178825	Amazon Linux 2 : libvncserver (ALAS-2023-2170)	Nessus	Amazon Linux Local Security Checks	Local	high
168468	SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2022:4330-1)	Nessus	SuSE Local Security Checks	Local	high
167649	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : LibVNCServer (SUSE-SU-2022:3990-1)	Nessus	SuSE Local Security Checks	Local	high
409868	Alpine: multiple libvncserver packages: security update to 0.9.13-r4 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
409868	Alpine: multiple libvncserver packages: security update to 0.9.13-r4 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
165753	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : LibVNCServer (SUSE-SU-2022:3540-1)	Nessus	SuSE Local Security Checks	Local	high
165593	Debian dla-3125 : libvncclient1 - security update	Nessus	Debian Local Security Checks	Local	high

Detections

Analytics

CVE-2020-29260

high

Tenable Plugins

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