HOMEVULNERABILITIESCVE-2011-4362
MEDIUMPOC

CVE-2011-4362

NVD-CWE-OtherPublished: December 24, 2011· Updated: Jun 16, 2026

5.0
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2011-4362 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2011-4362. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityNone
AvailabilityP
AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected Vendors & Products

Debian1 product(s)
debian linux
lighttpd1 product(s)
lighttpd
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt
PATCHhttp://redmine.lighttpd.net/issues/2370
PATCHhttp://www.openwall.com/lists/oss-security/2011/11/29/13
PATCHhttp://www.openwall.com/lists/oss-security/2011/11/29/8
PATCHhttp://download.lighttpd.net/lighttpd/security/lighttpd_sa_2011_01.txt
PATCHhttp://redmine.lighttpd.net/issues/2370
PATCHhttp://www.openwall.com/lists/oss-security/2011/11/29/13
PATCHhttp://www.openwall.com/lists/oss-security/2011/11/29/8
ADVISORYhttp://blog.pi3.com.pl/?p=277
ADVISORYhttp://jvn.jp/en/jp/JVN37417423/index.html
ADVISORYhttp://secunia.com/advisories/47260
ADVISORYhttp://www.debian.org/security/2011/dsa-2368
ADVISORYhttp://www.exploit-db.com/exploits/18295
ADVISORYhttp://www.securitytracker.com/id?1026359
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=758624
ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/71536
ADVISORYhttp://blog.pi3.com.pl/?p=277
ADVISORYhttp://jvn.jp/en/jp/JVN37417423/index.html
ADVISORYhttp://secunia.com/advisories/47260
ADVISORYhttp://www.debian.org/security/2011/dsa-2368
ADVISORYhttp://www.exploit-db.com/exploits/18295
ADVISORYhttp://www.securitytracker.com/id?1026359
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=758624
ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/71536

All References (26)

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

Quick Facts

CVE IDCVE-2011-4362
CVSS Score5.0 / 10
SeverityMEDIUM
WeaknessNVD-CWE-Other
CISA KEVNo
ExploitPOC
Affected2 vendor(s)
PublishedDec 24, 2011

Related CVEs (NVD-CWE-Other)

CVE-2005-2511
10.0
CVE-2005-2593
10.0
CVE-2005-2334
10.0
CVE-2005-2541
10.0
CVE-2005-2425
10.0
CVE-2005-2626
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2011-4362 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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