CVE-2009-1891

Http Server vulnerability

CVSS

7.1

EPSS

17.1%

EPSS pct

97th

Exploited

No known

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).

Affected vendor

Apache

Affected product

Http Server

CVSS vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Weakness type (CWE)

CWE-400 — Uncontrolled Resource Consumption

Published

2009-07-10

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to complete impact to availability.

Its EPSS score of 17.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2009-1891

Confirm whether Apache Http Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2009-1891.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-1891

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-1891 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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