CVE-2025-49177
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 |
| Vendor | x.org |
| Product | xwayland |
| Published | Jun 17, 2025 |
| Last Updated | Dec 11, 2025 |
Stay Ahead of the Next One
Get instant alerts for x.org xwayland
Be the first to know when new medium vulnerabilities affecting x.org xwayland are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
Low
Affected Versions
X.Org / xwayland
0 < 24.1.7
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2025:10258 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9303 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:9304 access.redhat.com: https://access.redhat.com/security/cve/CVE-2025-49177 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2369955 gitlab.freedesktop.org: https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af x.org: https://www.x.org/wiki/Development/Security/
Credits
Red Hat would like to thank Julian Suleder and Nils Emmerich for reporting this issue.