X11 XFixes Extension Memory Read via Request Length Omission
CVE-2025-49177 Published on June 17, 2025
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
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 Analysis
CVE-2025-49177 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a small impact on availability.
Timeline
Reported to Red Hat.
Made public. 14 days later.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2025-49177 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2025-49177
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Affected Versions
X.Org xwayland:- Before 24.1.7 is affected.
- Version 0:24.1.5-4.el10_0 and below * is unaffected.
- Version 0:1.20.11-31.el9_6 and below * is unaffected.
- Version 0:23.2.7-4.el9_6 and below * is unaffected.
- Version 0:22.1.9-6.el9_4 and below * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.