Information disclosure in X.org Xwayland
CVE-2025-49177
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.
Vulnerability class: Information Disclosure
EPSS: 0.001 (25.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L.
Affected products
- X.org Xwayland — versions 0
- Red Hat Enterprise Linux 10 — versions 0:24.1.5-4.el10_0
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:1.20.11-31.el9_6, 0:23.2.7-4.el9_6
- Red Hat Enterprise Linux 9.4 Extended Update Support — versions 0:22.1.9-6.el9_4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- RHSA-2025:10258 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2025:9303 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2025:9304 (vendor-advisory, x_refsource_REDHAT)
- access.redhat.com/security/cve/CVE-2025-49177 (vdb-entry, x_refsource_REDHAT)
- RHBZ#2369955 (issue-tracking, x_refsource_REDHAT)
- gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34b…
- www.x.org/wiki/Development/Security/
Frequently asked questions
- What is CVE-2025-49177?
- CVE-2025-49177 is a medium-severity vulnerability in X.org Xwayland, classified under Information Disclosure. CVSS score: 6.1/10. Published 2025-06-17.
- How severe is CVE-2025-49177?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2025-49177 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.