CVE-2025-49176

Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension

Published Jun 17, 2025 CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Description
A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.

Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4230-1 xorg-server security update
Debian DSA Debian DSA DSA-5947-1 xorg-server security update
EUVD EUVD EUVD-2025-18503 A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
Ubuntu USN Ubuntu USN USN-7573-1 X.Org X Server vulnerabilities
Ubuntu USN Ubuntu USN USN-7573-2 X.Org X Server vulnerabilities
References
Link Providers
http://www.openwall.com/lists/oss-security/2025/06/18/2 cve-icon
https://access.redhat.com/errata/RHSA-2025:10258 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10342 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10343 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10344 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10346 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10347 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10348 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10349 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10350 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10351 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10352 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10355 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10356 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10360 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10370 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10374 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10375 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10376 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10377 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10378 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10381 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:10410 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9303 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9304 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9305 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9306 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9392 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2025:9964 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2025-49176 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2369954 cve-icon cve-icon
https://gitlab.freedesktop.org/xorg/xserver/-/commit/03731b326a80b582e48d939fe62cb1e2b10400d9 cve-icon cve-icon
https://gitlab.freedesktop.org/xorg/xserver/-/commit/4fc4d76b2c7aaed61ed2653f997783a3714c4fe1 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/06/msg00028.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-49176 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-49176 cve-icon
https://www.x.org/wiki/Development/Security/ cve-icon cve-icon
History
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:6
Type Values Removed Values Added
CPEs cpe:/o:redhat:rhivos:1
Vendors & Products Redhat rhivos
Type Values Removed Values Added
First Time appeared Redhat rhivos
CPEs cpe:/o:redhat:rhivos:1
Vendors & Products Redhat rhivos
Type Values Removed Values Added
Metrics epss

{'score': 0.00015}

epss

{'score': 0.00032}

Type Values Removed Values Added
CPEs cpe:/a:redhat:rhel_aus:8.4
cpe:/a:redhat:rhel_aus:8.6
cpe:/a:redhat:rhel_e4s:8.6
cpe:/a:redhat:rhel_e4s:8.8
cpe:/a:redhat:rhel_e4s:9.0
cpe:/a:redhat:rhel_e4s:9.2
cpe:/a:redhat:rhel_eus_long_life:8.4
cpe:/a:redhat:rhel_eus_long_life:8.6
cpe:/a:redhat:rhel_eus_long_life:8.8
cpe:/a:redhat:rhel_tus:8.6
cpe:/a:redhat:rhel_tus:8.8
cpe:/o:redhat:rhel_aus:7.7
Type Values Removed Values Added
First Time appeared Redhat rhel E4s
Redhat rhel Eus Long Life
Redhat rhel Tus
CPEs cpe:/a:redhat:rhel_aus:8.4::appstream
cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_e4s:9.0::appstream
cpe:/a:redhat:rhel_e4s:9.2::appstream
cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
cpe:/a:redhat:rhel_eus_long_life:8.8::appstream
cpe:/a:redhat:rhel_tus:8.8::appstream
Vendors & Products Redhat rhel E4s
Redhat rhel Eus Long Life
Redhat rhel Tus
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:rhel_eus:9.4
Type Values Removed Values Added
First Time appeared Redhat rhel Eus
CPEs cpe:/a:redhat:rhel_eus:9.4::appstream
Vendors & Products Redhat rhel Eus
References
Type Values Removed Values Added
CPEs cpe:/a:redhat:rhel_aus:8.2
Type Values Removed Values Added
First Time appeared Redhat rhel Aus
CPEs cpe:/a:redhat:rhel_aus:8.2::appstream
Vendors & Products Redhat rhel Aus
References
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H'}

Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:9
cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:8::crb
cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:enterprise_linux:9::crb
cpe:/o:redhat:enterprise_linux:10.0
References
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check.
Title Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in big requests extension
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-190
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Nov 4, 2026, 9:35 PM
Reserved
Jun 3, 2025, 5:38 AM
Status
Deferred
Published
Jun 17, 2025, 3:15 PM
Modified
Nov 4, 2026, 10:17 PM
Severity
Important
Public date
Jun 17, 2025, 12:00 AM