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Fencer Intel
medium 5.0

CVE-2011-4362 json

Integer signedness error in the base64_decode function in the HTTP authentication functionality (http_auth.c) in lighttpd 1.4 before 1.4.30…

published 14y ago modified 4mo ago also EUVD-2011-4292

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
21.1%
EPSS 21.1% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

Integer signedness error in the base64_decode function in the HTTP authentication functionality (http_auth.c) in lighttpd 1.4 before 1.4.30 and 1.5 before SVN revision 2806 allows remote attackers to cause a denial of service (segmentation fault) via crafted base64 input that triggers an out-of-bounds read with a negative index.

Patch / fix

  • lighttpd lighttpd 1.4.30
  • lighttpd Debian 14, Debian 13, Debian 12 1.4.30-1

debian advisories DEBIAN-CVE-2011-4362

  • lighttpd openSUSE Tumbleweed 1.4.37-1.6

opensuse advisories openSUSE-SU-2024:10402-1

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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-2011-4362 updated cvss 5.0

lighttpd: Out of bounds read due to a signedness error (DoS, crash)

  • 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. Published
  2. First public exploit (EDB-18295)

Exploit prediction

21.11% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-18295 lighttpd - Denial of Service (PoC) dos, 2011-12-31
  • openwall.com http://www.openwall.com/lists/oss-security/2011/11/29/8 referenced PoC, tagged "exploit" by a source, unverified
  • download.lighttpd.net http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://www.openwall.com/lists/oss-security/2011/11/29/13 referenced PoC, tagged "exploit" by a source, unverified
  • redmine.lighttpd.net http://redmine.lighttpd.net/issues/2370 referenced PoC, tagged "exploit" by a source, unverified
  • blog.pi3.com.pl http://blog.pi3.com.pl/?p=277 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

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.