This update for xorg-x11-server fixes the following issues :

CVE-2020-14347: Leak of uninitialized heap memory from the X server to clients on pixmap allocation (bsc#1174633, ZDI-CAN-11426).

CVE-2020-14346: XIChangeHierarchy Integer Underflow Privilege Escalation Vulnerability (bsc#1174638, ZDI-CAN-11429).

CVE-2020-14345: XKB out-of-bounds access privilege escalation vulnerability (bsc#1174635, ZDI-CAN-11428).

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.

According to the versions of the xorg-x11-server packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in the way xserver memory was not     properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs     with elevated privileges, this could result in possible     ASLR bypass. Xorg-server before version 1.20.9 is     vulnerable.(CVE-2020-14347)

  - A flaw was found in xorg-x11-server in versions before     1.20.11. An integer underflow can occur in xserver     which can lead to a local privilege escalation. The     highest threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2021-3472)

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-005929 advisory.

    A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

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.

The remote Scientific Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the SLSA-2020:5408-1 advisory.

  - xorg-x11-server: Out-of-bounds access in XkbSetMap function (CVE-2020-14360)

  - xorg-x11-server: XkbSetDeviceInfo heap-based buffer overflow privilege escalation vulnerability     (CVE-2020-25712)

  - xorg-x11-server: Leak of uninitialized heap memory from the X server to clients in AllocatePixmap of     dix/pixmap.c (CVE-2020-14347)

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0114 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2020-14344:
    An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux.

    CVE-2020-14345:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability.

    CVE-2020-14346:
    A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14347:
    A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

    CVE-2020-14360:
    A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability.

    CVE-2020-14361:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14362:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14363:
    An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local     privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in     arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as     system availability.

    CVE-2020-25712:
    A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to     a privilege escalation vulnerability. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0087 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2020-14344:
    An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was     implemented in libX11 before version 1.6.10. As per upstream this is security relevant when setuid     programs call XIM client functions while running with elevated privileges. No such programs are shipped     with Red Hat Enterprise Linux.

    CVE-2020-14345:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability.

    CVE-2020-14346:
    A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol     decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14347:
    A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server     memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in     possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable.

    CVE-2020-14360:
    A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap     function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is     to data confidentiality and integrity as well as system availability.

    CVE-2020-14361:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14362:
    A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-     buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability.

    CVE-2020-14363:
    An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local     privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in     arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as     system availability.

    CVE-2020-25712:
    A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to     a privilege escalation vulnerability. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability.

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.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-2100:01 advisory.

    * xorg-x11-server: Out-of-bounds access in XkbSetNames function (CVE-2020-14345)
      * xorg-x11-server: Integer underflow in the X input extension protocol (CVE-2020-14346)
      * xorg-x11-server: Out-of-bounds access in XkbSetMap function (CVE-2020-14360)
      * xorg-x11-server: XkbSelectEvents integer underflow privilege escalation vulnerability (CVE-2020-14361)
      * xorg-x11-server: XRecordRegisterClients integer underflow privilege escalation vulnerability     (CVE-2020-14362)
      * libX11: Integer overflow leads to double free in locale handling (CVE-2020-14363)
      * xorg-x11-server: XkbSetDeviceInfo heap-based buffer overflow privilege escalation vulnerability     (CVE-2020-25712)
      * libX11: Heap overflow in the X input method client (CVE-2020-14344)
      * xorg-x11-server: Leak of uninitialized heap memory from the X server to clients in AllocatePixmap of     dix/pixmap.c (CVE-2020-14347)

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 MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-1136:01 advisory.

    xorg-x11-server: Out-of-bounds access in XkbSetMap function (CVE-2020-14360)         xorg-x11-server: XkbSetDeviceInfo heap-based buffer overflow privilege     escalation vulnerability (CVE-2020-25712)         xorg-x11-server: Leak of uninitialized heap memory from the X server to     clients in AllocatePixmap of dix/pixmap.c (CVE-2020-14347)

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 Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0279 advisory.

    This advisory aggregates security fixes for the xorg-x11-server SRPM in CIQ LTS 8.6. It addresses 34 CVEs:
    CVE-2022-46341, CVE-2023-6816, CVE-2021-4009, CVE-2024-0229, CVE-2021-4011, and 29 more.

Tenable has extracted the preceding description block directly from the CIQ 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
139847	SUSE SLES15 Security Update : xorg-x11-server (SUSE-SU-2020:2326-1)	Nessus	SuSE Local Security Checks	8/26/2020	9/17/2020	high
151323	EulerOS Virtualization for ARM 64 3.0.2.0 : xorg-x11-server (EulerOS-SA-2021-2085)	Nessus	Huawei Local Security Checks	7/2/2021	12/11/2023	high
301524	Unity Linux 20.1070e Security Update: xorg-x11-server (UTSA-2026-005929)	Nessus	Unity Linux Local Security Checks	3/9/2026	3/9/2026	medium
144211	Scientific Linux Security Update : xorg-x11-server on SL7.x i686/x86_64 (2020:5408)	Nessus	Scientific Linux Local Security Checks	12/15/2020	2/2/2024	high
236625	Alibaba Cloud Linux 3 : 0114: userspace graphics, xorg-x11, and mesa (ALINUX3-SA-2022:0114)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	5/14/2025	high
239686	TencentOS Server 3: userspace graphics, xorg-x11, and mesa (TSSA-2022:0087)	Nessus	Tencent Local Security Checks	6/16/2025	11/20/2025	high
294354	MiracleLinux 8 : userspace graphics, xorg-x11, and mesa, xorg-x11-server-1.20.10-1.el8 (AXSA:2021-2100:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
294725	MiracleLinux 4 : xorg-x11-server-1.17.4-18.0.2.AXS4 (AXSA:2021-1136:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
354155	Rocky Linux 8.6 [CIQ] Security Update: xorg-x11-server-Xdmx / xorg-x11-server-Xdmx-debuginfo / etc Multiple Vulnerabilities (ciqsa-2026_0279)	Nessus	Rocky Linux Local Security Checks	10/1/2026	10/12/2026	critical

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