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CVE-2025-49177

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

MEDIUM
6.1
CVSS Score
Published: June 17, 2025 at 02:49 PM UTC
Updated: June 30, 2026 at 11:16 AM UTC
2 products affected across 2 vendorsEnterprise LinuxXwayland

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Enterprise Linux· Red Hatrpm
60%
6
Vendor states this is fixed in 0:1.20.11-31.el9_6 (unaffected)
Vendor states this is fixed in 0:22.1.9-6.el9_4 (unaffected)
Vendor states this is fixed in 0:23.2.7-4.el9_6 (unaffected)
Vendor states this is fixed in 0:24.1.5-4.el10_0 (unaffected)
Xwayland· X Org
60%
v < 24.1.7
Affected range stops below 24.1.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (7)

Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2025:10258
Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2025:9304
VDB Entryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2025-49177
Issue Trackingx_refsource_REDHAT
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2369955
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2025:9303
Source: cverecord
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af
Source: cverecord
https://www.x.org/wiki/Development/Security/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-200

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