CVE-2025-49177: x.org xwayland
CVSS: 6.1v3.1MediumDeferred
AliasesUBUNTU-CVE-2025-49177DEBIAN-CVE-2025-49177
Published 17-06-2025Last modified 30-06-2026
Vulnerability summary
CVE-2025-49177 is a medium (CVSS 6.1) vulnerability in x.org xwayland. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 35.8% of scored vulnerabilities.
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)EPSS score
0.43%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 13 · Related 8Timeline
- 17-06-2025PublishedVulnerability first disclosed.
- 30-06-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:LSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
- NVDNIST6.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
EPSS trend
Probability
0.43%
Chance of exploitation in the next 30 days
Percentile
36%
Versus all other CVEs
30-day change
0.00 pp
From 0.43% on 19-09-2026
19-09-202619-10-2026
EPSS score0.43%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu4 products
- xorg-serverAll versions (No fix recorded) | < 2:21.1.4-2ubuntu1.7~22.04.15 | < 2:21.1.12-1ubuntu1.4 | < 2:21.1.18-1ubuntu1
- xorg-server-hwe-16.04All versions (No fix recorded)
- xorg-server-hwe-18.04All versions (No fix recorded)
- xwayland< 2:22.1.1-1ubuntu0.19 | < 2:23.2.6-1ubuntu0.6 | < 2:24.1.6-1ubuntu1
Debian2 products
- xorg-server< 2:21.1.7-3+deb12u10 | < 2:21.1.16-1.2
- xwaylandAll versions (No fix recorded) | < 2:24.1.8-1
X.org1 product
- xwayland< 24.1.7
3 vendors · 7 products
