Medium severity · published Jun 17, 2025
CVE-2025-49177
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
6.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9.4 Extended Update Support · Red Hat
All versions, or not specified · source: vendor
XW
xwayland · X.Org
before 24.1.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49177
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-49177
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:10258
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:9303
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:9304
access.redhat.com
https://access.redhat.com/security/cve/CVE-2025-49177
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2369955
gitlab.freedesktop.org
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af
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