Apache HTTP Server: Denial of Service (CVE-2011-0419)
Published Sources: CVE.org
What is affected, what to do
Stack consumption vulnerability in the fnmatch implementation in apr_fnmatch.c in the Apache Portable Runtime (APR) library before 1.4.3 and the Apache HTTP Server before 2.2.18, and in fnmatch.c in libc in NetBSD 5.1, OpenBSD 4.8, FreeBSD, Apple Mac OS X 10.6, Oracle Solaris 10, and Android, allows context-dependent attackers to cause a denial of service (CPU and memory consumption) via *? sequences in the first argument, as demonstrated by attacks against mod_autoindex in httpd.
Update Apache Software Foundation Portable Runtime to version 1.4.3.
- Affected
- Apache Software Foundation Portable Runtime
lt *..1.4.3 - Apache HTTP Server
lte 2.0.0..2.0.65 - Apache HTTP Server
lte 2.2.0..2.2.18 - Apple Mac OS X
eq 10.6.0..10.6.0 - NetBSD
eq 5.1..5.1 - OpenBSD
eq 4.8..4.8 - Oracle Solaris
eq 10..10 - Debian Linux
eq 5.0..5.0 - Debian Linux
eq 6.0..6.0 - Debian Linux
eq 7.0..7.0 - SUSE Linux Enterprise Server
eq 10..10
- Apache Software Foundation Portable Runtime
- Fixed in
- Apache Software Foundation Portable Runtime
1.4.3
- Apache Software Foundation Portable Runtime
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
—
Priority
No value is available for this vulnerability.
—
CVSS v3
No value is available for this vulnerability.
30.4 %
EPSS score
Elevated — model estimates 10-50% exploitation likelihood.
Source: FIRST EPSS, percentile 98.2
Show all metrics
- Severity
- Not rated
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 77.19 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 30.4 %
- Elevated — model estimates 10-50% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 98.2
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Stack consumption vulnerability in the fnmatch implementation in apr_fnmatch.c in the Apache Portable Runtime (APR) library before 1.4.3 and the Apache HTTP Server before 2.2.18, and in fnmatch.c in libc in NetBSD 5.1, OpenBSD 4.8, FreeBSD, Apple Mac OS X 10.6, Oracle Solaris 10, and Android, allows context-dependent attackers to cause a denial of service (CPU and memory consumption) via *? sequences in the first argument, as demonstrated by attacks against mod_autoindex in httpd.
Source: NVD (NIST), cvelistv5
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| apache | http_server |
|
|
| apache | portable_runtime |
|
|
Vendors and products
Affected operating systems
| BSD | freebsd | freebsd | — |
| BSD | netbsd | netbsd | 5.1 |
| BSD | openbsd | openbsd | 4.8 |
| Linux | debian | debian_linux | 5.0 |
| Linux | debian | debian_linux | 6.0 |
| Linux | debian | debian_linux | 7.0 |
| Linux | suse | linux_enterprise_server | 10 |
| macOS | apple | mac_os_x | 10.6.0 |
| Mobile | android | — | |
| Other | oracle | solaris | 10 |
References & sources
- secunia.com44574Third-party advisory, x_refsource_SECUNIA, Not applicable, Vendor advisory
- marc.infoHPSBUX02707Vendor advisory, x_refsource_HP, Issue tracking, Mailing list, Third-party advisory
- marc.infoSSRT100966Vendor advisory, x_refsource_HP, Issue tracking, Mailing list, Third-party advisory
- mail-archive.com[dev] 20110511 Re: Apache Portable Runtime 1.4.4 [...] ReleasedMailing list, x_refsource_MLIST, Mailing list, Third-party advisory
- secunia.com48308Third-party advisory, x_refsource_SECUNIA, Not applicable
- securityreason.com20110512 Multiple Vendors libc/fnmatch(3) DoS (incl apache)Third-party advisory, x_refsource_SREASONRES, Exploit, Third-party advisory
- marc.infoHPSBUX02702Vendor advisory, x_refsource_HP, Issue tracking, Mailing list, Third-party advisory
- marc.infoSSRT100619Vendor advisory, x_refsource_HP, Issue tracking, Mailing list, Third-party advisory
- oval.cisecurity.orgoval:org.mitre.oval:def:14804Vulnerability database, signature, x_refsource_OVAL, Third-party advisory
- oracle.comtechnetwork/topics/security/cpujuly2013-1899826.htmlx_refsource_CONFIRM, Third-party advisory
- cvsweb.netbsd.orgbsdweb.cgi/src/lib/libc/gen/fnmatch.cx_refsource_CONFIRM, Third-party advisory
- cxib.netstuff/apr_fnmatch.txtsx_refsource_MISC, Third-party advisory
- oval.cisecurity.orgoval:org.mitre.oval:def:14638Vulnerability database, signature, x_refsource_OVAL, Third-party advisory
- securitytracker.com1025527Vulnerability database, x_refsource_SECTRACK, Broken link, Third-party advisory, Vulnerability database
- svn.apache.orgviewvc?view=revision&revision=1098188x_refsource_CONFIRM, Patch, Vendor advisory
- openbsd.orgcgi-bin/cvsweb/src/lib/libc/gen/fnmatch.cx_refsource_CONFIRM, Broken link
- apache.orgdist/apr/CHANGES-APR-1.4x_refsource_CONFIRM, Broken link
- apache.orgdist/apr/Announcement1.x.htmlx_refsource_CONFIRM, Patch, Vendor advisory
- svn.apache.orgviewvc?view=revision&revision=1098799x_refsource_CONFIRM, Patch, Vendor advisory
- lists.apple.comAPPLE-SA-2011-10-12-3Vendor advisory, x_refsource_APPLE, Broken link
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2011-0419"><img src="https://intel.neosec.eu/badge/cve/CVE-2011-0419.svg?lang=en" alt="CVE-2011-0419 – NEOSEC Intel" height="20"></a>