CVE-2015-20109Public exploit

Application crash via fnmatch pattern buffer over-read

Published Jun 25, 2023 · Updated Nov 27, 2024

Buffer over-read in GNU C Library before 2.22 allows context-dependent attackers to crash applications through a malformed fnmatch pattern. The end_pattern helper, called by internal_fnmatch, reads beyond the pattern buffer when parsing an invalid **(!() pattern instead of rejecting it. An application must pass an attacker-influenced extended pattern to fnmatch, and user interaction is required; the bounded result is an application crash.

CVSS severity5.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in GNU C Library before 2.22 allows context-dependent attackers to crash applications through a malformed fnmatch pattern. The end_pattern helper, called by internal_fnmatch, reads beyond the pattern buffer when parsing an invalid **(!() pattern instead of rejecting it. An application must pass an attacker-influenced extended pattern to fnmatch, and user interaction is required; the bounded result is an application crash.

The record

CVE
CVE-2015-20109
Published
Jun 25, 2023
Updated
Nov 27, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 27, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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