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Vulnerability record · CVE-2012-5533 · published 24 November 2012

CVE-2012-5533: Lighttpd vulnerability

Lighttpd · Lighttpd

The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.

5.0 CVSS 2.0 Medium EPSS 12% · top 4.0% CWE-399 · CWE-399
5.0CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
32References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://download.lighttpd.net/lighttpd/security/lighttpd-1.4.31_fix_connection_header_dos.patch Patch
http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2012_01.txt Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2012-11/msg00044.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00051.html
http://marc.info/?l=bugtraq&m=141576815022399&w=2
http://osvdb.org/87623
http://packetstormsecurity.org/files/118282/Simple-Lighttpd-1.4.31-Denial-Of-Service.html
http://secunia.com/advisories/51268 Vendor Advisory
http://secunia.com/advisories/51298 Vendor Advisory
http://www.exploit-db.com/exploits/22902 Exploit
http://www.mandriva.com/security/advisories?name=MDVSA-2013:100
http://www.openwall.com/lists/oss-security/2012/11/21/1
http://www.securityfocus.com/bid/56619 Exploit
http://www.securitytracker.com/id?1027802
https://exchange.xforce.ibmcloud.com/vulnerabilities/80213
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0345
http://download.lighttpd.net/lighttpd/security/lighttpd-1.4.31_fix_connection_header_dos.patch Patch
http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2012_01.txt Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2012-11/msg00044.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00051.html
http://marc.info/?l=bugtraq&m=141576815022399&w=2
http://osvdb.org/87623
http://packetstormsecurity.org/files/118282/Simple-Lighttpd-1.4.31-Denial-Of-Service.html
http://secunia.com/advisories/51268 Vendor Advisory
http://secunia.com/advisories/51298 Vendor Advisory
http://www.exploit-db.com/exploits/22902 Exploit
http://www.mandriva.com/security/advisories?name=MDVSA-2013:100
http://www.openwall.com/lists/oss-security/2012/11/21/1
http://www.securityfocus.com/bid/56619 Exploit
http://www.securitytracker.com/id?1027802
https://exchange.xforce.ibmcloud.com/vulnerabilities/80213
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0345

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Source: NIST National Vulnerability Database (record CVE-2012-5533), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.