CVE-2013-2028

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 87.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2013-07-20 · updated 2026-06-16
Weakness: CWE-787

Description

The ngx_http_parse_chunked function in http/ngx_http_parse.c in nginx 1.3.9 through 1.4.0 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow.

Affected products

nginx: from 1.3.9 through 1.4.0
Fedoraproject Fedora: 19

References

http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105176.html
http://mailman.nginx.org/pipermail/nginx-announce/2013/000112.html
http://nginx.org/download/patch.2013.chunked.txt
http://packetstormsecurity.com/files/121675/Nginx-1.3.9-1.4.0-Denial-Of-Service.html
http://secunia.com/advisories/55181
http://security.gentoo.org/glsa/glsa-201310-04.xml
http://www.osvdb.org/93037
http://www.securityfocus.com/bid/59699
http://www.vnsecurity.net/2013/05/analysis-of-nginx-cve-2013-2028/
https://github.com/rapid7/metasploit-framework/pull/1834
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105176.html
http://mailman.nginx.org/pipermail/nginx-announce/2013/000112.html

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