CVE-2011-1928 Denial of service in n/a
Remote attackers can cause a denial of service via infinite loop in APR fnmatch when specific wildcard patterns are used.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-1928?
CVE-2011-1928 is a medium-severity denial of service vulnerability in Apache Http Server, published on 24 May 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-399
Which versions are affected by CVE-2011-1928?
It affects 2 products.
Linux distribution packages (25)
apr Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-26.el4 |
apr-debuginfo Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-26.el4 |
apr-devel Red Hat:enterprise_linux:4::as | All versions | 0:0.9.4-26.el4 |
apr Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-26.el4 |
apr-debuginfo Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-26.el4 |
apr-devel Red Hat:enterprise_linux:4::desktop | All versions | 0:0.9.4-26.el4 |
apr Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-26.el4 |
apr-debuginfo Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-26.el4 |
apr-devel Red Hat:enterprise_linux:4::es | All versions | 0:0.9.4-26.el4 |
apr Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-26.el4 |
apr-debuginfo Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-26.el4 |
apr-devel Red Hat:enterprise_linux:4::ws | All versions | 0:0.9.4-26.el4 |
apr Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_6.5 |
apr-debuginfo Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_6.5 |
apr-docs Red Hat:enterprise_linux:5::client | All versions | 0:1.2.7-11.el5_6.5 |
apr Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_6.5 |
apr-debuginfo Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_6.5 |
apr-devel Red Hat:enterprise_linux:5::client_workstation | All versions | 0:1.2.7-11.el5_6.5 |
apr Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_6.5 |
apr-debuginfo Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_6.5 |
apr-devel Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_6.5 |
apr-docs Red Hat:enterprise_linux:5::server | All versions | 0:1.2.7-11.el5_6.5 |
apr Red Hat:enterprise_linux:6::server | All versions | 0:1.3.9-3.el6_1.2 |
apr-debuginfo Red Hat:enterprise_linux:6::server | All versions | 0:1.3.9-3.el6_1.2 |
apr-devel Red Hat:enterprise_linux:6::server | All versions | 0:1.3.9-3.el6_1.2 |
Products include Apache Apr-Util, Apache Http Server.
How do I fix CVE-2011-1928?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2011-1928 being exploited?
There is no known exploitation of CVE-2011-1928 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
- CVE-2009-2412 Integer overflow in n/a
- CVE-2026-32327 Apache Portable Runtime Utility: apr-util XML stack recursion crash
- CVE-2026-34191 Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle
- CVE-2025-49506 Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack
- CVE-2026-34501 Apache Portable Runtime Utility: Heap buffer overflow in APR redis client
Sources
Also known as DEBIAN-CVE-2011-1928, GHSA-9h43-8fmr-wxgx, RHSA-2011:0844.