What is CVE-2025-49178?

CVE-2025-49178 is a medium-severity vulnerability in X.org Xwayland, classified under Improper Locking. CVSS score: 5.5/10. Published 2025-06-17.

How severe is CVE-2025-49178?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2025-49178 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in X.org Xwayland

CVE-2025-49178

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.

EPSS: 0.002 (45.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

X.org Xwayland — versions 0
Red Hat Enterprise Linux 10 — versions 0:24.1.5-4.el10_0
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 6 Extended Lifecycle Support - Extension — versions 0:1.1.0-25.el6_10.1
Red Hat Enterprise Linux 7.7 Advanced Update Support — versions 0:1.8.0-17.el7_7.1
Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:1.20.4-32.el7_9, 0:1.8.0-36.el7_9.2
Red Hat Enterprise Linux 8 — versions 0:1.20.11-26.el8_10, 0:21.1.3-18.el8_10, 0:1.15.0-7.el8_10
Red Hat Enterprise Linux 8.2 Advanced Update Support — versions 0:1.9.0-15.el8_2.14, 0:1.20.6-4.el8_2
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:1.20.10-2.el8_4, 0:1.11.0-8.el8_4.13
Red Hat Enterprise Linux 8.4 Extended Update Support Long-life Add-on — versions 0:1.20.10-2.el8_4, 0:1.11.0-8.el8_4.13

Weakness classification (CWE)

CWE-667 — Improper Locking

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

RHSA-2025:10258 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10342 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10343 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10344 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10346 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10347 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10348 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10349 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10350 (vendor-advisory, x_refsource_REDHAT)
RHSA-2025:10351 (vendor-advisory, x_refsource_REDHAT)

Frequently asked questions

What is CVE-2025-49178?: CVE-2025-49178 is a medium-severity vulnerability in X.org Xwayland, classified under Improper Locking. CVSS score: 5.5/10. Published 2025-06-17.
How severe is CVE-2025-49178?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2025-49178 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.