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Fencer Intel
medium 5.0

CVE-2012-5533 json

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…

published 2012-11-24 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-5425

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
12.0%
EPSS 12.0% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • lighttpd Debian 14, Debian 13, Debian 12 1.4.31-2

debian advisories DEBIAN-CVE-2012-5533

  • lighttpd openSUSE Tumbleweed 1.4.37-1.6

opensuse advisories openSUSE-SU-2024:10402-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-5533 updated cvss 5.0

lighttpd: Denial of Service via malformed Connection headers

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-22902)
  2. Published

Exploit prediction

12.04% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-22902 lighttpd 1.4.31 - Denial of Service (PoC) dos, 2012-11-22
  • securityfocus.com http://www.securityfocus.com/bid/56619 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.