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Vulnerability record · public intelligence
CVE-2025-49177
MEDIUM
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
Published Jun 17, 2025 · Updated Nov 3, 2026
Severity · CVSSMEDIUM · Not scored
Known exploitationNot listed
EPSS / likelihood0.44%
QFinch risk scoreNot available
Original summary
Normalized public record · Updated Nov 3, 2026
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
FIRST-EPSSCVE-LIST-V5
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- RHSA-2025:10258 ↗
- RHSA-2025:9303 ↗
- RHSA-2025:9304 ↗
- access.redhat.com ↗
- RHBZ#2369955 ↗
- Patch commit ↗
- www.x.org ↗
Record history
Published Jun 17, 2025 · Last refreshed Nov 3, 2026