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CVE-2023-43787

25
FAUCET Score

CVE-2023-43787 is an integer overflow vulnerability in the XCreateImage() function of libX11, affecting various versions of Fedora and Red Hat Enterprise Linux. This flaw allows a local attacker to achieve arbitrary code execution with elevated privileges. Rated High severity with a CVSS score of 7.8, it requires local access but has low attack complexity and no user interaction. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.8.7CPE matchmatch criteria
cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
38CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0043 is in the 75th percentile among its peer group of 16,994 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (3)

microsoftpatch availablevia msrc
Product: cbl2 libX11 1.8.7-1 on CBL Mariner 2.0Fixed in: 1.8.7-1
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libX11-0:1.6.8-8.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: libX11-0:1.7.0-9.el9
View patch

Vendor Advisories (2)

microsoft2023-Oct/CVE-2023-43787Important

Libx11: integer overflow in xcreateimage() leading to a heap overflow

Oct 10, 2023
redhatCVE-2023-43787Moderate

libX11: integer overflow in XCreateImage() leading to a heap overflow

Oct 4, 2023

References

jfrog.com / blog/xorg-libx11-vulns-cve-2023-43786-cve-2023-43787-part-two
lists.debian.org / debian-lts-announce/2023/10/msg00005.html
security.netapp.com / advisory/ntap-20231103-0006
openwall.com / lists/oss-security/2024/01/24/9
access.redhat.com / errata/RHSA-2024:2145
access.redhat.com / errata/RHSA-2024:2973
access.redhat.com / security/cve/CVE-2023-43787
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory