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Vulnerability · Published Jun 17, 2025 · Assigned by redhat

CVE-2025-49178Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore

Medium 5.5

In plain English

A medium-severity security flaw 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 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 84.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8tigervnc1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-icons1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-icons1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-license1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-license1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-selinux1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-selinux1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-server1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-server1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-server-minimal1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-server-minimal1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8tigervnc-server-module1.15.0-7.el8_10ALSA-2025:9392
AlmaLinux:9tigervnc-server-module1.14.1-8.el9_6ALSA-2025:9306
AlmaLinux:8xorg-x11-server-Xdmx1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xdmx1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-Xephyr1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xephyr1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-Xnest1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xnest1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-Xorg1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xorg1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-Xvfb1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xvfb1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:10xorg-x11-server-Xwayland24.1.5-4.el10_0ALSA-2025:9304
AlmaLinux:8xorg-x11-server-Xwayland21.1.3-18.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-Xwayland23.2.7-4.el9_6ALSA-2025:9303
AlmaLinux:10xorg-x11-server-Xwayland-devel24.1.5-4.el10_0ALSA-2025:9304
AlmaLinux:9xorg-x11-server-Xwayland-devel23.2.7-4.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-common1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-common1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-devel1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-devel1.20.11-31.el9_6ALSA-2025:9303
AlmaLinux:8xorg-x11-server-source1.20.11-26.el8_10ALSA-2025:9305
AlmaLinux:9xorg-x11-server-source1.20.11-31.el9_6ALSA-2025:9303
Alpine:v3.22xorg-server21.1.17-r0ALPINE-CVE-2025-49178
Alpine:v3.23xorg-server21.1.17-r0ALPINE-CVE-2025-49178
Alpine:v3.24xorg-server21.1.17-r0ALPINE-CVE-2025-49178
Alpine:v3.22xwayland24.1.7-r0ALPINE-CVE-2025-49178
Alpine:v3.23xwayland24.1.7-r0ALPINE-CVE-2025-49178
Alpine:v3.24xwayland24.1.7-r0ALPINE-CVE-2025-49178
Debian:12xorg-server2:21.1.7-3+deb12u10DSA-5947-1
Debian:12xorg-server2:21.1.7-3+deb12u10DEBIAN-CVE-2025-49178
Debian:13xorg-server2:21.1.16-1.2DEBIAN-CVE-2025-49178
Debian:14xorg-server2:21.1.16-1.2DEBIAN-CVE-2025-49178
Debian:12xwaylandno fix listedDEBIAN-CVE-2025-49178
Debian:13xwaylandno fix listedDEBIAN-CVE-2025-49178
Debian:14xwayland2:24.1.8-1DEBIAN-CVE-2025-49178
Rocky Linux:8tigervnc0:1.15.0-7.el8_10RLSA-2025:9392
Rocky Linux:9tigervnc0:1.14.1-8.el9_6RLSA-2025:9306
Rocky Linux:8xorg-x11-server0:1.20.11-26.el8_10RLSA-2025:9305
Rocky Linux:9xorg-x11-server0:1.20.11-31.el9_6RLSA-2025:9303
Rocky Linux:10xorg-x11-server-Xwayland0:24.1.5-4.el10_0RLSA-2025:9304
Rocky Linux:8xorg-x11-server-Xwayland0:21.1.3-18.el8_10RLSA-2025:9305
Rocky Linux:9xorg-x11-server-Xwayland0:23.2.7-4.el9_6RLSA-2025:9303
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-2025-49178
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.4USN-7573-1
Ubuntu:24.04:LTSxorg-server2:21.1.12-1ubuntu1.4UBUNTU-CVE-2025-49178
Ubuntu:25.10xorg-server2:21.1.18-1ubuntu1UBUNTU-CVE-2025-49178
Ubuntu:26.04:LTSxorg-server2:21.1.18-1ubuntu1UBUNTU-CVE-2025-49178
Ubuntu:22.04:LTSxwayland2:22.1.1-1ubuntu0.19UBUNTU-CVE-2025-49178
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-2025-49178
Ubuntu:25.10xwayland2:24.1.6-1ubuntu1UBUNTU-CVE-2025-49178
Ubuntu:26.04:LTSxwayland2:24.1.6-1ubuntu1UBUNTU-CVE-2025-49178

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 6 Extended Lifecycle Support - EXTENSION see references
Red Hat Red Hat Enterprise Linux 7.7 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 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 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references

Weakness: CWE-667 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References