Is CVE-2009-1891 in the CISA KEV catalog?

No. CVE-2009-1891 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-1891?

CVE-2009-1891 has a CVSS v2 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2009-1891?

CVE-2009-1891 has an EPSS score of 17.11% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-1891?

Upgrade apache2 on debian 11 to 2.2.11-7 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2009-1891

HIGHEPSS 97th pctl

7.1

CVSS v2

NVD

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).

CWE-400Resource Exhaustion

How to fix

Remediation Available

apache2Debian

Fixed in:2.2.11-7CVE-2009-1891

httpdWindows application

Affected:2.0.35 2.0.64Fixed in:2.0.64Apache Lounge

Affected:2.2.0 2.2.12Fixed in:2.2.12Apache Lounge

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

17.11%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	88%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.