How severe is CVE-2013-4322?

No CVSS score has been assigned to CVE-2013-4322 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-4322?

CVE-2013-4322 affects the following packages: org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven), org.apache.tomcat:tomcat (Maven). Ecosystems affected: Maven.

How do I fix CVE-2013-4322?

Update org.apache.tomcat:tomcat to 6.0.39 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4322 is resolved across your whole dependency graph.

How do I detect CVE-2013-4322 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2013-4322 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2013-4322 actively exploited in the wild?

No public exploit code has been indexed for CVE-2013-4322 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2013-4322?

CVE-2013-4322 has an EPSS (Exploit Prediction Scoring System) score of 9.1%, placing it in the 95th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2013-4322?

CVE-2013-4322 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2013-4322 published, and has it been updated?

CVE-2013-4322 was published on May 14, 2022 and was last updated on November 28, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

CVE-2013-4322 — tomcat

Fix: apache/tomcat@70dc3b2

CVE-2013-4322 is a Improper Input Validation vulnerability in org.apache.tomcat:tomcat. A fix is available for org.apache.tomcat:tomcat — see the affected versions and patch details below.

Apache Tomcat Denial of Service vulnerability

Published

May 14, 2022

Updated

Nov 28, 2024

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2013-4322.

EPSS Exploitation Probability

via FIRST.org ↗

9.1%probability of exploitation in next 30 days

Lower Risk-0.36%

Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

3 pkgs affected

☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat☕org.apache.tomcat:tomcat

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.tomcat:tomcat`	all versions	6.0.39`org.apache.tomcat:tomcat:6.0.39`
☕Maven	`org.apache.tomcat:tomcat`	≥ 7.0.0&&< 7.0.50	7.0.50`org.apache.tomcat:tomcat:7.0.50`
☕Maven	`org.apache.tomcat:tomcat`	≥ 8.0.0-RC1&&< 8.0.0-RC10	8.0.0-RC10`org.apache.tomcat:tomcat:8.0.0-RC10`

Affected Products

1 product · 191 configurations

Application

tomcatapache

≤ 6.0.37

173 versions

1.1.33.03.13.1.13.23.2.13.2.23.2.33.2.43.33.3.13.3.1a

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tomcat:tomcat to 6.0.39 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4322 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Red Hat Enterprise Linux 6	`tomcat6-0:6.0.24-64.el6_5`	RHSA-2014:0429
Red Hat Enterprise Linux 7	`tomcat-0:7.0.42-5.el7_0`	RHSA-2014:0686
Red Hat JBoss Enterprise Web Server 2 for RHEL 5	`tomcat6-0:6.0.37-19_patch_04.ep6.el5`	RHSA-2014:0525
Red Hat JBoss Enterprise Web Server 2 for RHEL 5	`tomcat7-0:7.0.40-13_patch_02.ep6.el5`	RHSA-2014:0526
Red Hat JBoss Web Server 2.0	`tomcat7`	RHSA-2014:0527
Red Hat JBoss Web Server 2.0	`tomcat6`	RHSA-2014:0528

Ubuntu

USN-2130-1Ubuntu

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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