CVE-2009-1891

NONECVSS 0.0Trending — 4 sources updated this weekElevated

0.0

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 v3: —
EG Score: 0.0(none)
EPSS: 95.4%
KEV: Not listed

Published

July 10, 2009

Last Modified

April 23, 2026

References (110)

secalert@redhathttp://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712
secalert@redhathttp://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
secalert@redhathttp://lists.opensuse.org/opensuse-security-announce/2009-10/msg00006.html
secalert@redhathttp://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2
secalert@redhathttp://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2
secalert@redhathttp://marc.info/?l=bugtraq&m=129190899612998&w=2
secalert@redhathttp://marc.info/?l=bugtraq&m=130497311408250&w=2
secalert@redhathttp://osvdb.org/55782
secalert@redhathttp://secunia.com/advisories/35721
secalert@redhathttp://secunia.com/advisories/35781
secalert@redhathttp://secunia.com/advisories/35793
secalert@redhathttp://secunia.com/advisories/35865
secalert@redhathttp://secunia.com/advisories/37152
secalert@redhathttp://secunia.com/advisories/37221
secalert@redhathttp://security.gentoo.org/glsa/glsa-200907-04.xml

Vendor Advisories for CVE-2009-1891(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

RHSA-2009:1580
Red Hat Product SecurityMedium
Red Hat Security Advisory: httpd security update

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	apache2-common (2.0.55-4ubuntu2.6) @ dapper	2026-05-30	ubuntu
redhat	xml-commons-0:1.3.02-2jpp_1rh	2010-08-04	redhat
redhat	httpd-0:2.0.52-41.ent.6	2009-11-11	redhat
redhat	httpd-0:2.0.46-75.ent	2009-08-10	redhat
redhat	httpd22-0:2.2.10-23.1.ep5.el4	2009-07-17	redhat
redhat	httpd-0:2.2.10-10.ep5.el5	2009-07-14	redhat
redhat	httpd-0:2.2.3-22.el5_3.2	2009-07-09	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-400Uncontrolled Resource Consumption (Denial of Service)

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:10 UTCepss_batch
2026-06-02 20:10 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:13 UTCepss_batch
2026-05-31 00:13 UTCepss_batch
2026-05-30 16:12 UTCEG score recompute
2026-05-30 16:12 UTCVendor advisory
2026-05-30 16:12 UTCGHSA enrichment
2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 08:14 UTCOSV refresh
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch

Frequently asked(4)

What is CVE-2009-1891?

CVE-2009-1891 is a none vulnerability published on July 10, 2009. 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).

When was CVE-2009-1891 disclosed?

CVE-2009-1891 was first published in the National Vulnerability Database on July 10, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2009-1891 actively exploited?

CVE-2009-1891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2009-1891?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-1891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2009-1891

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CVE-2009-1891

Published

Last Modified

References (110)

Vendor Advisories for CVE-2009-1891(1)

Patch Availability(7)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2009-1891?

Same vendor

Same CWE

CVE-2009-1891

📅 Published

🔄 Last Modified

🔗 References (110)

📣 Vendor Advisories for CVE-2009-1891(1)

Patch Availability(7)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2009-1891?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (110)

Vendor Advisories for CVE-2009-1891(1)

Frequently asked(4)

Related CVEs(same vendor + same CWE)