CVE-2025-49178

MEDIUMNVD 5.55.5—

5.5

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 v3: 5.5
EG Score: 5.5(medium)
EPSS: 45.8%
KEV: Not listed

Published

June 17, 2025

Last Modified

April 15, 2026

References (33)

secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10258
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10342
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10343
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10344
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10346
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10347
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10348
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10349
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10350
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10351
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10352
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10355
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10356
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10360
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:10370

Patch Availability(30)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xwayland (2:24.1.6-1ubuntu0.1) @ plucky	2026-05-21	ubuntu
ubuntu	xwayland-hwe-16.04 (2:1.19.6-1ubuntu4.1~16.04.6+esm10) @ xenial	2026-05-21	ubuntu
redhat	tigervnc-0:1.11.0-8.el8_4.13	2025-07-07	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.4	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.11-26.el9_4	2025-07-07	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-8.el9_2	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.11-18.el9_2	2025-07-07	redhat
redhat	tigervnc-0:1.12.0-14.el9_2.12	2025-07-07	redhat
redhat	tigervnc-0:1.13.1-8.el9_4.7	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.11-5.el8_6.3	2025-07-07	redhat
redhat	tigervnc-0:1.8.0-36.el7_9.2	2025-07-07	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-11.el8_8	2025-07-07	redhat
redhat	tigervnc-0:1.11.0-22.el9_0.15	2025-07-07	redhat
redhat	tigervnc-0:1.8.0-17.el7_7.1	2025-07-07	redhat
redhat	tigervnc-0:1.1.0-25.el6_10.1	2025-07-07	redhat
redhat	tigervnc-0:1.9.0-15.el8_2.14	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.10-2.el8_4	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.11-16.el8_8	2025-07-07	redhat
redhat	tigervnc-0:1.12.0-15.el8_8.14	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.4-32.el7_9	2025-07-07	redhat
redhat	tigervnc-0:1.12.0-6.el8_6.14	2025-07-07	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-3.el9_0	2025-07-07	redhat
redhat	xorg-x11-server-0:1.20.11-11.el9_0	2025-07-07	redhat
redhat	xorg-x11-server-Xwayland-0:22.1.9-6.el9_4	2025-07-02	redhat
redhat	xorg-x11-server-0:1.20.6-4.el8_2	2025-06-30	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-18.el8_10	2025-06-23	redhat
redhat	xorg-x11-server-Xwayland-0:23.2.7-4.el9_6	2025-06-23	redhat
redhat	tigervnc-0:1.14.1-8.el9_6	2025-06-23	redhat
redhat	tigervnc-0:1.15.0-7.el8_10	2025-06-23	redhat
redhat	xorg-x11-server-Xwayland-0:24.1.5-4.el10_0	2025-06-23	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-667

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-03 04:10 UTCOSV refresh
2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2025-49178?

CVE-2025-49178 is a medium vulnerability published on June 17, 2025. 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.

When was CVE-2025-49178 disclosed?

CVE-2025-49178 was first published in the National Vulnerability Database on June 17, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-49178 actively exploited?

CVE-2025-49178 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-49178?

CVE-2025-49178 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2025-49178?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-49178, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-49178

Published

Last Modified

References (33)

Patch Availability(30)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-49178?

Same vendor

Same CWE

CVE-2025-49178

📅 Published

🔄 Last Modified

🔗 References (33)

Patch Availability(30)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-49178?

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References (33)

Frequently asked(5)

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