What is CVE-2011-1928?

CVE-2011-1928 is a vulnerability in Apache Apr-Util, classified under CWE-399. Published 2011-05-24.

Is CVE-2011-1928 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apache Apr-Util

CVE-2011-1928

The fnmatch implementation in apr_fnmatch.c in the Apache Portable Runtime (APR) library 1.4.3 and 1.4.4, and the Apache HTTP Server 2.2.18, allows remote attackers to cause a denial of service (infinite loop) via a URI that does not match unspecified types of wildcard patterns, as demonstrated by attacks against mod_autoindex in httpd when a /*/WEB-INF/ configuration pattern is used. NOTE: this issue exists because of an incorrect fix for CVE-2011-0419.

Published 2011-05-24 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 4.3 (Medium). Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.103 (95.7th percentile), scored 2026-10-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.103 · newest: 0.103 · change: 0.000

Affected products

Apache Apr-Util — versions 1.4.3, 1.4.4
Apache HTTP Server — versions 2.2.18

Weakness classification (CWE)

CWE-399

Public proof-of-concept exploits

References

www.redhat.com/support/errata/RHSA-2011-0844.html (vendor-advisory)
secunia.com/advisories/44661 (Vendor Advisory, third-party-advisory)
marc.info/ (vendor-advisory)
secunia.com/advisories/48308 (third-party-advisory)
www.mandriva.com/security/advisories (vendor-advisory)
bugs.debian.org/cgi-bin/bugreport.cgi
www.vupen.com/english/advisories/2011/1289 (vdb-entry, Vendor Advisory)
secunia.com/advisories/44613 (third-party-advisory)
mail-archives.apache.org/mod_mbox/www-announce/201105.mbox/<4DD55076.1060005@ap… (mailing-list)
openwall.com/lists/oss-security/2011/05/19/5 (mailing-list)

Frequently asked questions

What is CVE-2011-1928?: CVE-2011-1928 is a vulnerability in Apache Apr-Util, classified under CWE-399. Published 2011-05-24.
Is CVE-2011-1928 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.