CVE-2011-4362Integer signedness error in the base64_decode function in the HTTP authentication functionality (http_auth.c) in lighttpd 1.4 before…
- 5.0MediumCVSS base score
- 21.1%Exploitation in 30 daysEPSS · top 2.4% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list an Exploit-DB entry for it. A reference of the record is tagged as an exploit.
Show the exploits2
Exploit-DB1 entry
- lighttpd - Denial of Service (PoC) (Exploit-DB entry) (opens in a new tab)
EDB-ID 18295dos, linuxpublished 31 Dec 2011Verified
References tagged exploit1 reference
- 18295 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By redhat
- 50 days later
· 50 days later
Published
- 13 years later
· 13 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 21.1% · top 2.4% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
References13
- 47260 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 20111224 Lighttpd Proof of Concept code for CVE-2011-4362 (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- [oss-security] 20111129 CVE Request: lighttpd/mod_auth out-of-bounds read due to signedness error (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=758624 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-2368 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 18295 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
- http://blog.pi3.com.pl/?p=277 (opens in a new tab)x_refsource_MISCx_transferred
- http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- [oss-security] 20111129 Re: CVE Request: lighttpd/mod_auth out-of-bounds read due to signedness error (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1026359 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- lighttpd-base64-dos(71536) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- http://redmine.lighttpd.net/issues/2370 (opens in a new tab)x_refsource_CONFIRMx_transferred
- JVN#37417423 (opens in a new tab)third-party-advisoryx_refsource_JVNx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2011-4292 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2011-4362)Record last updated .