CVE-2023-0687: A vulnerability was found in GNU C Library 2.38

Q: How do I fix CVE-2023-0687?

glibc: upgrade to 2.38. Exact commands for each OS are on this page.

Q: Is CVE-2023-0687 being exploited?

CVE-2023-0687 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-0687 affect?

CVE-2023-0687 affects glibc. Severity is medium (CVSS 4.6). A vulnerability was found in GNU C Library 2.38. It has been declared as critical. This vulnerability affects the function __monstartup of the file gmon.c of the component Call Graph Monitor. The manipulation leads to buffer overflow. It is

Q: How urgent is CVE-2023-0687?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 4.6UPGRADE

CVE-2023-0687 is a medium-severity flaw (CVSS 4.6) affecting glibc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in GNU C Library 2.38. It has been declared as critical. This vulnerability affects the function __monstartup of the file gmon.c of the component Call Graph Monitor. The manipulation leads to buffer overflow. It is recommended to apply a patch to fix this issue. VDB-220246 is the identifier assigned to this vulnerability. NOTE: The real existence of this vulnerability is still doubted at the moment. The inputs that induc

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-02-06
Last modified	2026-10-14

Publisher (CNA): VulDB · Vendor: gnu

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-06 19:15 UTCPublished CVE record published
2026-10-14 21:17 UTCUpdated Record last modified

gnu glibc UPGRADE

Affected: < 2.38

Fixed in: 2.38

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy glibc || rpm -q glibc || glibc --version

2. UPGRADE to 2.38 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade glibc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glibc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-0687?

glibc: upgrade to 2.38. Exact commands for each OS are on this page.

Is CVE-2023-0687 being exploited?

CVE-2023-0687 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-0687 affect?

CVE-2023-0687 affects glibc. Severity is medium (CVSS 4.6). A vulnerability was found in GNU C Library 2.38. It has been declared as critical. This vulnerability affects the function __monstartup of the file gmon.c of the component Call Graph Monitor. The manipulation leads to buffer overflow. It is

How urgent is CVE-2023-0687?

Priority 32/100. No elevated risk signals yet.

Software pages

glibc vulnerabilities

Related CVEs

CVE-2023-4813 MEDIUM 5.9 UPGRADE MITIGATE A flaw has been identified in glibc
CVE-2023-25139 CRITICAL 9.8 MITIGATE sprintf in the GNU C Library (glibc) 2.37 has a buffer overflow (out-of-bounds write) in some situations with
CVE-2023-5156 HIGH 7.5 UPGRADE MITIGATE A flaw was found in the GNU C Library
CVE-2023-4911 HIGH 7.8 EXPLOITED MITIGATE MITIGATE GNU C Library Buffer Overflow Vulnerability
CVE-2022-23219 CRITICAL 9.8 UPGRADE DOWNGRADE The deprecated compatibility function clnt_create in the sunrpc module of the GNU C Library (aka glibc) throug

References

← Back to latest CVEs