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CVE-2009-1891

7.1 · HIGH

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a de…

Published Jul 10, 2009apacheCWE-400EPSS 17.11%

Overview

CVE-2009-1891 is a high-severity vulnerability affecting apache http_server. It was published on July 10, 2009 and has a CVSS 2.0 base score of 7.1 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption).

Remediation

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
apachehttp_server>= 2.0.35, < 2.0.64Affected

References

Refbugs.debian.org/cgi-bin/bugreport.cgi?bug=534712Reflists.apple.com/archives/security-announce/2009/Nov/msg00000.htmlReflists.opensuse.org/opensuse-security-announce/2009-10/msg00006.htmlRefmarc.info/?l=apache-httpd-dev&m=124621326524824&w=2Refmarc.info/?l=apache-httpd-dev&m=124661528519546&w=2Refmarc.info/?l=bugtraq&m=129190899612998&w=2Refmarc.info/?l=bugtraq&m=130497311408250&w=2Refosvdb.org/55782Refsecunia.com/advisories/35721Refsecunia.com/advisories/35781

How CyberStrike helps

Frequently asked questions

What is CVE-2009-1891?

CVE-2009-1891 is a high-severity vulnerability affecting apache http_server. It was published on July 10, 2009 and has a CVSS 2.0 base score of 7.1 (HIGH).

How severe is CVE-2009-1891?

This vulnerability has a CVSS 2.0 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-1891?

Check the references section for vendor advisories and patches from apache. Update http_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-1891?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-1891 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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