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CVE-2016-7951

31
FAUCET Score

CVE-2016-7951 describes multiple integer overflows in X.org libXtst versions prior to 1.2.3, allowing remote X servers to cause out-of-bounds memory access due to insufficient range checks. This vulnerability affects Fedora and X.org libXtst products. It carries a critical CVSS score of 9.8, indicating a high potential for compromise of confidentiality, integrity, and availability with low attack complexity and no user interaction required. While not listed in CISA's KEV catalog and lacking public exploit code in Metasploit, Nuclei, or ExploitDB, it has garnered some community discussion and media coverage, suggesting awareness of its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
24CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
25CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
<= 1.2.2CPE matchmatch criteria
cpe:2.3:a:x:libxtst:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.44%
Probability of exploitation in next 30 days
EPSS Percentile
82.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0244 is in the 73rd percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libXtst
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libXtst
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libXtst

Vendor Advisories (1)

redhatCVE-2016-7951Moderate

libXtst: Insufficient validation of server responses result in Integer overflows

Sep 25, 2016

References

cgit.freedesktop.org / xorg/lib/libXtst/commit
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/AFLHX7WNEUXXDAGR324T35L5P6RRR7GE
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/RVEUZRHYY3AJEKMFQ4DS7DX3Y2AICFP7
lists.x.org / archives/xorg-announce/2016-October/002720.html
openwall.com / lists/oss-security/2016/10/04/2
openwall.com / lists/oss-security/2016/10/04/4
securityfocus.com / bid/93370
securitytracker.com / id/1036945