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CVE-2011-1928

22
FAUCET Score

CVE-2011-1928 describes a denial-of-service vulnerability in the Apache Portable Runtime (APR) library (versions 1.4.3 and 1.4.4) and Apache HTTP Server 2.2.18, stemming from an infinite loop in the fnmatch implementation. This flaw can be triggered remotely by a specially crafted URI that does not match specific wildcard patterns, particularly affecting mod_autoindex configurations. The vulnerability has a CVSS score of 4.3, indicating a medium severity with low impact on availability (A:P) and moderate attack complexity (AC:M). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, suggesting a low current threat level.

Impacted Technologies

VendorProductVersion(s)CPE
1.4.3CPE matchmatch criteria
cpe:2.3:a:apache:apr-util:1.4.3:*:*:*:*:*:*:*
1.4.4CPE matchmatch criteria
cpe:2.3:a:apache:apr-util:1.4.4:*:*:*:*:*:*:*
2.2.18CPE matchmatch criteria
cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
10.32%
Probability of exploitation in next 30 days
EPSS Percentile
95.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.1032 is in the 95th percentile among its peer group of 19,953 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: apr-0:0.9.4-26.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: apr-0:1.2.7-11.el5_6.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: apr-0:1.3.9-3.el6_1.2
View patch

Vendor Advisories (1)

redhatCVE-2011-1928Low

apr: DoS flaw in apr_fnmatch() due to fix for CVE-2011-0419

May 19, 2011

References

bugs.debian.org / cgi-bin/bugreport.cgi
lists.opensuse.org / opensuse-security-announce/2011-11/msg00011.html
mail-archives.apache.org / mod_mbox/httpd-announce/201105.mbox/%3C4DD55092.3030403%40apache.org%3E
mail-archives.apache.org / mod_mbox/www-announce/201105.mbox/%3c4DD55076.1060005%40apache.org%3e
marc.info
openwall.com / lists/oss-security/2011/05/19/10
openwall.com / lists/oss-security/2011/05/19/5
secunia.com / advisories/44558
Vendor Advisory
secunia.com / advisories/44613
secunia.com / advisories/44661
Vendor Advisory
secunia.com / advisories/44780
secunia.com / advisories/48308
issues.apache.org / bugzilla/show_bug.cgi
mandriva.com / security/advisories
redhat.com / support/errata/RHSA-2011-0844.html
vupen.com / english/advisories/2011/1289
Vendor Advisory
vupen.com / english/advisories/2011/1290
Vendor Advisory