CVE-2013-4322

Apache Tomcat < 6.0.39, 7.x < 7.0.50, 8.x < 8.0.0-RC10 - Denial of Service via Chunked Transfer Coding

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2013-4322. PoCs published by LiviuPtr.

AI-analyzed exploit summary This PoC demonstrates a slow POST chunked transmission vulnerability (CVE-2013-4322) by sending large chunks of data in a loop to exhaust server resources. It uses HTTP chunked encoding to maintain persistent connections and flood the target.

Description

Apache Tomcat before 6.0.39, 7.x before 7.0.50, and 8.x before 8.0.0-RC10 processes chunked transfer coding without properly handling (1) a large total amount of chunked data or (2) whitespace characters in an HTTP header value within a trailer field, which allows remote attackers to cause a denial of service by streaming data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-3544.

Exploits (1)

nomisec WORKING POC
by LiviuPtr · poc
https://github.com/LiviuPtr/CVE-2013-4322_PoC

This PoC demonstrates a slow POST chunked transmission vulnerability (CVE-2013-4322) by sending large chunks of data in a loop to exhaust server resources. It uses HTTP chunked encoding to maintain persistent connections and flood the target.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Generic HTTP servers vulnerable to slow POST attacks (e.g., Apache, Nginx, or other servers mishandling chunked encoding)
No auth needed
Prerequisites: Network access to the target server · Server vulnerable to slow POST chunked transmission
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (41)

Core 41
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
https://rhn.redhat.com/errata/RHSA-2014-0686.html
Vendor Advisory vendor-advisory x_refsource_mandriva
http://www.mandriva.com/security/advisories?name=MDVSA-2015:052
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/59724
Issue Tracking x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1069905
Vendor Advisory vendor-advisory x_refsource_mandriva
http://www.mandriva.com/security/advisories?name=MDVSA-2015:084
Vendor Advisory x_refsource_confirm
http://tomcat.apache.org/security-7.html
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/534161/100/0/threaded
Various Sources x_refsource_confirm
http://www-01.ibm.com/support/docview.wss?uid=swg21678113
Vendor Advisory x_refsource_confirm
http://tomcat.apache.org/security-8.html
Various Sources x_refsource_confirm
http://www-01.ibm.com/support/docview.wss?uid=swg21677147
Third Party Advisory vendor-advisory x_refsource_debian
http://www.debian.org/security/2016/dsa-3530
Various Sources x_refsource_confirm
http://www-01.ibm.com/support/docview.wss?uid=swg21678231
Third Party Advisory x_refsource_confirm
http://advisories.mageia.org/MGASA-2014-0148.html
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/59722
Vendor Advisory x_refsource_confirm
http://tomcat.apache.org/security-6.html
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/59675
Vendor Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2130-1
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/59873
Mailing List mailing-list x_refsource_fulldisc
http://seclists.org/fulldisclosure/2014/Dec/23
Various Sources x_refsource_confirm
http://www-01.ibm.com/support/docview.wss?uid=swg21667883
Mailing List vendor-advisory x_refsource_hp
http://marc.info/?l=bugtraq&m=144498216801440&w=2
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/65767
Various Sources x_refsource_confirm
http://www-01.ibm.com/support/docview.wss?uid=swg21675886
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/59036

Scores

EPSS 0.3628
EPSS Percentile 97.2%

Details

CWE
CWE-20
Status published
Products (47)
apache/tomcat 7.0.0 (2 CPE variants)
apache/tomcat 7.0.1
apache/tomcat 7.0.2 (2 CPE variants)
apache/tomcat 7.0.3
apache/tomcat 7.0.4 (2 CPE variants)
apache/tomcat 7.0.10
apache/tomcat 7.0.11
apache/tomcat 7.0.12
apache/tomcat 7.0.13
apache/tomcat 7.0.14
... and 37 more
Published Feb 26, 2014
Tracked Since Feb 18, 2026