# 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. - **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 24 May 2011 - **Updated:** 6 Aug 2024 - **Also known as:** DEBIAN-CVE-2011-1928, GHSA-9h43-8fmr-wxgx, RHSA-2011:0844 ## 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. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `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: Apache Apr-Util, Apache Http Server. ## How do I fix CVE-2011-1928? Apply the vendor's patch. ## 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](https://insights.sbomify.com/CVE-2009-2412/): Integer overflow in n/a (critical 10.0) - [CVE-2026-32327](https://insights.sbomify.com/CVE-2026-32327/): Apache Portable Runtime Utility: apr-util XML stack recursion crash (critical 9.1) - [CVE-2026-34191](https://insights.sbomify.com/CVE-2026-34191/): Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle (critical 9.1) - [CVE-2025-49506](https://insights.sbomify.com/CVE-2025-49506/): Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack (high 7.5) - [CVE-2026-34501](https://insights.sbomify.com/CVE-2026-34501/): Apache Portable Runtime Utility: Heap buffer overflow in APR redis client (high 7.5) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2011-1928 and fix it if it is affected. What it is: 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. Exploitation: There is no known exploitation of CVE-2011-1928 in the wild and no public exploit code. Affected product: Apache Http Server. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2011-1928/ (Markdown: https://insights.sbomify.com/CVE-2011-1928/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1928 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1928 - OSV: https://osv.dev/vulnerability/CVE-2011-1928 --- From sbomify Insights: https://insights.sbomify.com/CVE-2011-1928/ Summaries are generated and may contain mistakes; the official description above is the record.