Integer signedness error in the base64_decode function in the HTTP authentication…
Priority MEDIUM 42Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
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.
Why it matters now
EPSS 0.21106 97th percentileScored 2026-11-07
Public exploit Yes 6 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* | 1.4.1 to before 1.4.30 | Vulnerable | lighttpd |
| cpe:2.3:a:lighttpd:lighttpd:1.5.0:*:*:*:*:*:*:* | 1.5.0 | Vulnerable | lighttpd |
| cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:* | 5.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
- cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* Versions 1.4.1 to before 1.4.30 Vulnerable ·lighttpd
- cpe:2.3:a:lighttpd:lighttpd:1.5.0:*:*:*:*:*:*:* Versions 1.5.0 Vulnerable ·lighttpd
- cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2011-4362
- 2026-10-03 Alias added: GHSA-wx9r-x448-8rcp
References
Exploit 6
- [oss-security] 20111129 CVE Request: lighttpd/mod_auth out-of-bounds read due to signedness error
- 18295
- http://blog.pi3.com.pl/?p=277
- http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt
- [oss-security] 20111129 Re: CVE Request: lighttpd/mod_auth out-of-bounds read due to signedness error
- http://redmine.lighttpd.net/issues/2370
Sources
- CVE-2011-4362 · CVE Program
- CVE-2011-4362 · NVD
- FIRST EPSS
- GHSA-wx9r-x448-8rcp · GitHub Advisory Database · CC BY 4.0
- CVE-2011-4362 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences