CVE-2023-0687

Profiling-memory corruption via undersized arc table

Published Feb 6, 2023 · Updated Nov 25, 2024

Buffer overflow in GNU C Library 2.38 Call Graph Monitor allows context-dependent attackers to corrupt profiling memory during call recording. __monstartup underallocates the froms arc table, and _mcount uses an unchecked derived index to write past the profiling buffer. Reachability requires control of addresses in a gmon-enabled profiled application, which itself requires a separate security flaw; upstream disputes any security impact.

CVSS severity9.8
Critical
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in GNU C Library 2.38 Call Graph Monitor allows context-dependent attackers to corrupt profiling memory during call recording. __monstartup underallocates the froms arc table, and _mcount uses an unchecked derived index to write past the profiling buffer. Reachability requires control of addresses in a gmon-enabled profiled application, which itself requires a separate security flaw; upstream disputes any security impact.

The record

CVE
CVE-2023-0687
Published
Feb 6, 2023
Updated
Nov 25, 2024
Vendor
The GnuPG Project
Product
GNU C Library
Classifications
CWE-120
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=2.38

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The GnuPG Project · GNU C Libraryversion=2.38

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.6VulDBCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
4.0NISTAV:A/AC:H/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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