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Vulnerability · Published Jun 17, 2025 · Assigned by redhat

CVE-2025-49177Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode

Medium 6.1

In plain English

A medium-severity information exposure in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.4%top 61.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10xorg-x11-server-Xwayland24.1.5-4.el10_0ALSA-2025:9304
AlmaLinux:10xorg-x11-server-Xwayland-devel24.1.5-4.el10_0ALSA-2025:9304
Alpine:v3.22xorg-server21.1.17-r0ALPINE-CVE-2025-49177
Alpine:v3.23xorg-server21.1.17-r0ALPINE-CVE-2025-49177
Alpine:v3.24xorg-server21.1.17-r0ALPINE-CVE-2025-49177
Alpine:v3.22xwayland24.1.7-r0ALPINE-CVE-2025-49177
Alpine:v3.23xwayland24.1.7-r0ALPINE-CVE-2025-49177
Alpine:v3.24xwayland24.1.7-r0ALPINE-CVE-2025-49177
Debian:12xorg-server2:21.1.7-3+deb12u10DEBIAN-CVE-2025-49177
Debian:12xorg-server2:21.1.7-3+deb12u10DSA-5947-1
Debian:13xorg-server2:21.1.16-1.2DEBIAN-CVE-2025-49177
Debian:14xorg-server2:21.1.16-1.2DEBIAN-CVE-2025-49177
Debian:12xwaylandno fix listedDEBIAN-CVE-2025-49177
Debian:13xwaylandno fix listedDEBIAN-CVE-2025-49177
Debian:14xwayland2:24.1.8-1DEBIAN-CVE-2025-49177
Rocky Linux:10xorg-x11-server-Xwayland0:24.1.5-4.el10_0RLSA-2025:9304
Ubuntu:22.04:LTSxorg-server2:21.1.4-2ubuntu1.7~22.04.15USN-7573-1
Ubuntu:22.04:LTSxorg-server2:21.1.4-2ubuntu1.7~22.04.15UBUNTU-CVE-2025-49177
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.4USN-7573-1
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.4UBUNTU-CVE-2025-49177
Ubuntu:25.10xorg-server2:21.1.18-1ubuntu1UBUNTU-CVE-2025-49177
Ubuntu:26.04:LTSxorg-server2:21.1.18-1ubuntu1UBUNTU-CVE-2025-49177
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.19UBUNTU-CVE-2025-49177
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.19USN-7573-1
Ubuntu:24.04:LTSxwayland2:23.2.6-1ubuntu0.6USN-7573-1
Ubuntu:24.04:LTSxwayland2:23.2.6-1ubuntu0.6UBUNTU-CVE-2025-49177
Ubuntu:25.10xwayland2:24.1.6-1ubuntu1UBUNTU-CVE-2025-49177
Ubuntu:26.04:LTSxwayland2:24.1.6-1ubuntu1UBUNTU-CVE-2025-49177

Affected products (as reported)

VendorProductVersions
X.Org xwayland 0 – before 24.1.7
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-200 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

References