{"cve":"CVE-2009-1891","nvd":{"published":"2009-07-10T15:30:00.187","modified":"2026-06-16T23:08:17.760","status":"Modified","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).","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-400"],"references":["http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712","http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html","http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00006.html","http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2","http://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2"],"products":["apache:http_server","canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","redhat:enterprise_linux_desktop","redhat:enterprise_linux_eus","redhat:enterprise_linux_server","redhat:enterprise_linux_server_aus","redhat:enterprise_linux_workstation"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1891","score":0.17111,"percentile":0.97084,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}