CVE-2007-3946

CVE-2007-3946 is a medium-severity vulnerability in Lighttpd with a CVSS 2.0 base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.4)
• EPSS exploit prediction: 3% (87th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Lighttpd
• Published: 2007-07-24
• Last modified: 2026-06-16

Description

mod_auth (http_auth.c) in lighttpd before 1.4.16 allows remote attackers to cause a denial of service (daemon crash) via unspecified vectors involving (1) a memory leak, (2) use of md5-sess without a cnonce, (3) base64 encoded strings, and (4) trailing whitespace in the Auth-Digest header.

Frequently asked questions

What is CVE-2007-3946?

mod_auth (http_auth.c) in lighttpd before 1.4.16 allows remote attackers to cause a denial of service (daemon crash) via unspecified vectors involving (1) a memory leak, (2) use of md5-sess without a cnonce, (3) base64 encoded strings, and (4) trailing whitespace in the Auth-Digest header.

How severe is CVE-2007-3946?

CVE-2007-3946 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2007-3946 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3946?

CVE-2007-3946 affects Lighttpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-3946?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2007-3946 published?

CVE-2007-3946 was published on 2007-07-24 and last updated on 2026-06-16.

References

• http://osvdb.org/38314
• http://osvdb.org/38315
• http://osvdb.org/38316
• http://osvdb.org/38317
• http://secunia.com/advisories/26130
• http://secunia.com/advisories/26158
• http://secunia.com/advisories/26505
• http://secunia.com/advisories/26593
• http://security.gentoo.org/glsa/glsa-200708-11.xml
• http://trac.lighttpd.net/trac/browser/branches/lighttpd-1.4.x/NEWS?rev=1875
• http://trac.lighttpd.net/trac/changeset/1875
• http://www.debian.org/security/2007/dsa-1362
• http://www.novell.com/linux/security/advisories/2007_15_sr.html
• http://www.securityfocus.com/archive/1/474131/100/0/threaded
• http://www.securityfocus.com/bid/24967
• http://www.vupen.com/english/advisories/2007/2585
• https://issues.rpath.com/browse/RPL-1550
• https://issues.rpath.com/browse/RPL-1554

Affected products (1)

• cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:*

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