CVE-2011-4362

Exp

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.

Published: 2011-12-24 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4362 is rated High Exploit Risk (73.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 16.25%, 97th percentile). 7 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +11.85% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2011-4362

EDB-ID Source Kind Published Link
18295 exploit_db edb 2011-12-31 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
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Exploit prediction scoring system (EPSS) score for CVE-2011-4362

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.39% 16.25% +11.85%
2 2026-04-12 3.64% 4.39% +0.75%
3 2025-12-28 — 3.64% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4362

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-4362

OS Trackers for CVE-2011-4362

vendor priority summary link
debian low CVE-2011-4362 low priority: Debian including 1 source packages (lighttpd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4362
gentoo high CVE-2011-4362: 1 GLSA(s) (201406-10), 1 atom(s) (www-servers/lighttpd); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-4362
ubuntu medium CVE-2011-4362 medium priority: Ubuntu including 1 source packages (lighttpd), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 5, ignored 1. https://ubuntu.com/security/CVE-2011-4362

Affected software / configurations for CVE-2011-4362

Vendor Product Version Raw CPE
lighttpd lighttpd >= 1.4.1, < 1.4.30 cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:*
lighttpd lighttpd 1.5.0 cpe:2.3:a:lighttpd:lighttpd:1.5.0:*:*:*:*:*:*:*
debian debian_linux 5.0 cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

References for CVE-2011-4362

URL Tags
http://archives.neohapsis.com/archives/bugtraq/2011-12/0167.html Broken Link
http://blog.pi3.com.pl/?p=277 Exploit Third Party Advisory
http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt Exploit Patch Vendor Advisory
http://jvn.jp/en/jp/JVN37417423/index.html Third Party Advisory
http://redmine.lighttpd.net/issues/2370 Exploit Patch Vendor Advisory
http://secunia.com/advisories/47260 Third Party Advisory
http://www.debian.org/security/2011/dsa-2368 Third Party Advisory
http://www.exploit-db.com/exploits/18295 Exploit Third Party Advisory VDB Entry
http://www.openwall.com/lists/oss-security/2011/11/29/13 Exploit Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2011/11/29/8 Exploit Mailing List Patch Third Party Advisory
http://www.securitytracker.com/id?1026359 Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=758624 Issue Tracking Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/71536 Third Party Advisory VDB Entry
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