CVE-2009-1902

ModSecurity < 2.5.9 - Denial of Service via Multipart Form Data Request

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-1902. PoCs published by Juan Galiana Lara.

AI-analyzed exploit summary This is a vulnerability writeup for CVE-2009-1902, detailing a remote Denial of Service (DoS) vulnerability in ModSecurity versions < 2.5.9. The vulnerability arises from insufficient input sanitization in the multipart processor, leading to a segmentation fault when processing crafted multipart/form-data requests.

Description

The multipart processor in ModSecurity before 2.5.9 allows remote attackers to cause a denial of service (crash) via a multipart form datapost request with a missing part header name, which triggers a NULL pointer dereference.

Exploits (1)

exploitdb WRITEUP VERIFIED
by Juan Galiana Lara · textdosmultiple
https://www.exploit-db.com/exploits/8241

This is a vulnerability writeup for CVE-2009-1902, detailing a remote Denial of Service (DoS) vulnerability in ModSecurity versions < 2.5.9. The vulnerability arises from insufficient input sanitization in the multipart processor, leading to a segmentation fault when processing crafted multipart/form-data requests.

Classification
Writeup 100%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: ModSecurity < 2.5.9
No auth needed
Prerequisites: ModSecurity < 2.5.9 installed on Apache HTTP Server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (14)

Core 14
Core References
Third Party Advisory vendor-advisory x_refsource_fedora
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00487.html
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/49212
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/8241
Third Party Advisory vendor-advisory x_refsource_gentoo
http://security.gentoo.org/glsa/glsa-200907-02.xml
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/34256
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/35687
Broken Link vdb-entry x_refsource_osvdb
http://www.osvdb.org/52553
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/34311
Third Party Advisory vendor-advisory x_refsource_fedora
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00529.html
Not Applicable vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00003.html
Exploit, Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/501968
Third Party Advisory vdb-entry x_refsource_vupen
http://www.vupen.com/english/advisories/2009/0703
Exploit, Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/34096

Scores

EPSS 0.1373
EPSS Percentile 96.0%

Details

CWE
CWE-476
Status published
Products (3)
fedoraproject/fedora 9
fedoraproject/fedora 10
trustwave/modsecurity < 2.5.9
Published Jun 03, 2009
Tracked Since Feb 18, 2026