CVE-2011-4362Lighttpd Vulnerability
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…
Published Dec 24, 2011 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2011-4362
Key Facts
Routine patching- CVE-2011-4362 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Lighttpd, Debian Linux, lighttpd-fastcgi (amazon) and 7 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 21% probability of exploitation in the next 30 days.
- Fixed versions are available, including Lighttpd 1.4.19-5+lenny3, Lighttpd 1.4.28-2+squeeze1, Lighttpd 1.4.30-1.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Scores
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
21%
Higher than 97.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
38/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2011-4362
- advisoryJVN#37417423
- advisoryhttps://bugzilla.redhat.com/show_bug.cgi?id=758624
- advisory47260
- advisorylighttpd-base64-dos(71536)
- advisoryDSA-2368
Description
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.
Affected Products
28 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| LighttpdLighttpd | 1.5.0 | 1.4.30 |
| Debian LinuxDebian | 5.0, 6.0, 7.0 | n/a |
| lighttpd-fastcgiamazon | See advisory | 1.4.31-1.2.amzn1 |
| lighttpd-mod_geoipamazon | See advisory | 1.4.31-1.2.amzn1 |
| lighttpd-mod_mysql_vhostamazon | See advisory | 1.4.31-1.2.amzn1 |
Patched Releases
Lighttpd
1.4.19-5+lenny3, 1.4.28-2+squeeze1, 1.4.30-1, 1.4.31-1.2.amzn1, 1.4.37-1.6, 1.4.30
lighttpd-fastcgi
1.4.31-1.2.amzn1
lighttpd-mod_cml
1.4.37-1.6
lighttpd-mod_geoip
1.4.31-1.2.amzn1, 1.4.37-1.6
lighttpd-mod_magnet
1.4.37-1.6
lighttpd-mod_mysql_vhost
1.4.31-1.2.amzn1, 1.4.37-1.6
lighttpd-mod_rrdtool
1.4.37-1.6
lighttpd-mod_trigger_b4_dl
1.4.37-1.6
lighttpd-mod_webdav
1.4.37-1.6
Timeline
Publicly disclosed
Dec 24, 2011
Last updated
Aug 4, 2026
References
- advisorysecurity-tracker.debian.org · CVE-2011-4362
- advisoryJVN#37417423
- advisorybugzilla.redhat.com · show_bug.cgi
- advisory47260
- advisorylighttpd-base64-dos(71536)
FAQ
Common Questions.
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 nega…
Affected: Lighttpd versions 1.5.0; Debian Linux versions 5.0, 6.0, 7.0; lighttpd-fastcgi (amazon), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Lighttpd 1.4.19-5+lenny3, Lighttpd 1.4.28-2+squeeze1, Lighttpd 1.4.30-1.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
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