Is CVE-2025-49177 in the CISA KEV catalog?

No. CVE-2025-49177 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-49177?

CVE-2025-49177 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2025-49177?

CVE-2025-49177 has an EPSS score of 0.36% (28th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-49177?

Upgrade xorg-server on debian 12 to 2:21.1.7-3+deb12u10 or later. Fixes are available for 44 affected products.

CVE & CISA-KEV Catalog

CVE-2025-49177

MEDIUM

6.1

CVSS v3

NVD

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.

CWE-200Information Exposure

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:21.1.7-3+deb12u10CVE-2025-49177

Fixed in:2:21.1.16-1.2CVE-2025-49177

xorg-x11-serverRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-serverRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XdmxRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XdmxRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xdmx-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xdmx-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XephyrRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XephyrRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xephyr-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xephyr-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XnestRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XnestRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xnest-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xnest-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XorgRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XorgRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xorg-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xorg-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XvfbRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XvfbRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xvfb-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-Xvfb-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-XwaylandRed Hat / RHEL

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

xorg-x11-server-XwaylandRocky

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

xorg-x11-server-Xwayland-debuginfoRocky

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

xorg-x11-server-Xwayland-debuginfoRed Hat / RHEL

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

xorg-x11-server-Xwayland-debugsourceRed Hat / RHEL

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

xorg-x11-server-Xwayland-debugsourceRocky

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

Fixed in:0:22.1.9-6.el9_4RHSA-2025:10258

xorg-x11-server-Xwayland-develRocky

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

xorg-x11-server-Xwayland-develRed Hat / RHEL

Fixed in:0:24.1.5-4.el10_0RHSA-2025:9304

Fixed in:0:23.2.7-4.el9_6RHSA-2025:9303

xorg-x11-server-commonRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-commonRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-debuginfoRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-debugsourceRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-debugsourceRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-develRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-develRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-sourceRed Hat / RHEL

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-x11-server-sourceRocky

Fixed in:0:1.20.11-31.el9_6RHSA-2025:9303

xorg-serverUbuntu

Fixed in:2:21.1.4-2ubuntu1.7~22.04.15USN-7573-1

Fixed in:2:21.1.12-1ubuntu1.4USN-7573-1

xserver-xorg-coreUbuntu

Fixed in:2:21.1.4-2ubuntu1.7~22.04.15USN-7573-1

Fixed in:2:21.1.12-1ubuntu1.4USN-7573-1

xwaylandUbuntu

Fixed in:2:22.1.1-1ubuntu0.19USN-7573-1

Fixed in:2:23.2.6-1ubuntu0.6USN-7573-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Exploit Intelligence

0.36%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Other references7

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-30.