CVE-2009-1891

high Apache
CVSS v3 Base Score
7.1
AV:N/AC:M/Au:N/C:N/I:N/A:C
EPSS Score
18.8%
Exploitation probability in 30 days
Top 5% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
M
Confidentiality
None
Integrity
None
Availability
C
Published: July 10, 2009 (6152 days ago)
Last Modified: April 23, 2026
Vendor: Apache
Source: 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

CWE-400

Affected Products

apache http serverdebian debian linuxfedoraproject fedoracanonical ubuntu linuxredhat enterprise linux desktopredhat enterprise linux eusredhat enterprise linux serverredhat enterprise linux server ausredhat enterprise linux workstation

References

🔗 bugs.debian.org 🔗 lists.apple.com 🔗 lists.opensuse.org 🔗 marc.info 🔗 marc.info