CVE-2007-4727

CVE-2007-4727 is a medium-severity vulnerability in Lighttpd with a CVSS 2.0 base score of 6.8. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.8)
• EPSS exploit prediction: 13% (96th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Lighttpd
• Published: 2007-09-12
• Last modified: 2026-06-16

Description

Buffer overflow in the fcgi_env_add function in mod_proxy_backend_fastcgi.c in the mod_fastcgi extension in lighttpd before 1.4.18 allows remote attackers to overwrite arbitrary CGI variables and execute arbitrary code via an HTTP request with a long content length, as demonstrated by overwriting the SCRIPT_FILENAME variable, aka a "header overflow."

Frequently asked questions

What is CVE-2007-4727?

Buffer overflow in the fcgi_env_add function in mod_proxy_backend_fastcgi.c in the mod_fastcgi extension in lighttpd before 1.4.18 allows remote attackers to overwrite arbitrary CGI variables and execute arbitrary code via an HTTP request with a long content length, as demonstrated by overwriting the SCRIPT_FILENAME variable, aka a "header overflow."

How severe is CVE-2007-4727?

CVE-2007-4727 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2007-4727 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4727?

CVE-2007-4727 affects Lighttpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-4727?

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

When was CVE-2007-4727 published?

CVE-2007-4727 was published on 2007-09-12 and last updated on 2026-06-16.

References

• http://fedoranews.org/updates/FEDORA-2007-213.shtml
• http://secunia.com/advisories/26732
• http://secunia.com/advisories/26794
• http://secunia.com/advisories/26824
• http://secunia.com/advisories/26997
• http://secunia.com/advisories/27229
• http://securityreason.com/securityalert/3127
• http://secweb.se/en/advisories/lighttpd-fastcgi-remote-vulnerability/
• http://trac.lighttpd.net/trac/changeset/1986
• http://www.gentoo.org/security/en/glsa/glsa-200709-16.xml
• http://www.lighttpd.net/assets/2007/9/9/lighttpd_sa_2007_12.txt
• http://www.novell.com/linux/security/advisories/2007_20_sr.html
• http://www.securityfocus.com/archive/1/479763/100/0/threaded
• http://www.securityfocus.com/bid/25622
• http://www.vupen.com/english/advisories/2007/3110
• https://bugzilla.redhat.com/show_bug.cgi?id=284511
• https://exchange.xforce.ibmcloud.com/vulnerabilities/36526
• https://issues.rpath.com/browse/RPL-1715

Affected products (1)

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

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