5.5

CVE-2025-49178: x.org xwayland Improper Locking

CVSS: 5.5v3.1MediumDeferred
AliasesUBUNTU-CVE-2025-49178DEBIAN-CVE-2025-49178
Published 17-06-2025Last modified 30-06-2026
Open JSON

Vulnerability summary

CVE-2025-49178 is a medium (CVSS 5.5) Improper Locking vulnerability in x.org xwayland. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 43 · Related 12
DLA-4230-1DSA-5947-1MGASA-2025-0199OPENSUSE-SU-2025:15310-1OPENSUSE-SU-2025:15311-1RHSA-2025:10258

Timeline

  1. 17-06-2025
    PublishedVulnerability first disclosed.
  2. 30-06-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu4 products
  • xorg-serverAll versions (No fix recorded) | < 2:1.18.4-0ubuntu0.12+esm18 | < 2:1.19.6-1ubuntu4.15+esm13 | < 2:1.20.13-1ubuntu1~20.04.20+esm1 | < 2:21.1.4-2ubuntu1.7~22.04.15 | < 2:21.1.12-1ubuntu1.4 | < 2:21.1.18-1ubuntu1
  • xorg-server-hwe-16.04< 2:1.19.6-1ubuntu4.1~16.04.6+esm10
  • xorg-server-hwe-18.04< 2:1.20.8-2ubuntu2.2~18.04.11+esm5
  • 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

3 vendors · 7 products

References

39 links
Show all 39 references