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CVE-2023-4156

21
FAUCET Score

CVE-2023-4156 is a heap out-of-bounds read vulnerability in the gawk package's builtin.c, affecting various versions of Fedora and Red Hat Enterprise Linux. This flaw, with a CVSS score of 7.1 (High), can be triggered locally with low attack complexity, potentially leading to system crashes or the disclosure of sensitive information. While the vulnerability is rated as high severity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding it. The low EPSS score further suggests a low probability of exploitation in the wild.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE match
cpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
< 5.1.1CPE matchmatch criteria
cpe:2.3:a:gnu:gawk:*:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
38CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.4MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.43%
Probability of exploitation in next 30 days
EPSS Percentile
35.1%
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 35th percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 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 (5)

microsoftpatch availablevia msrc
Product: 18307-16823Fixed in: 5.1.1-1
microsoftpatch availablevia msrc
Product: cbl2 gawk 5.1.1-1 on CBL Mariner 2.0Fixed in: 5.1.1-1
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: gawk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: gawk
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: gawk

Vendor Advisories (2)

microsoft2023-Sep/CVE-2023-4156Important

Heap out of bound read in builtin.c

Sep 12, 2023
redhatCVE-2023-4156Low

gawk: heap out of bound read in builtin.c

Jun 19, 2023

References

access.redhat.com / security/cve/CVE-2023-4156
ExploitIssue TrackingRelease NotesThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
ExploitIssue TrackingRelease NotesThird Party Advisory