CVE-2012-6687

FastCGI (aka fcgi and libfcgi) 2.4.0 allows remote attackers to cause a denial of service (segmentation fault and crash) via a large number of connections.

Published: 2015-02-19 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-6687 is rated Moderate Risk (53.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 25.51%, 96th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-6687

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-25 25.41% 25.51% +0.10%
2 2026-01-09 25.51% 25.41% -0.10%
3 2025-08-11 — 25.51% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-6687

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2012-6687

OS Trackers for CVE-2012-6687

vendor priority summary link
debian not yet assigned CVE-2012-6687 not yet assigned priority: Debian including 2 source packages (libfcgi, libfcgi-perl), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2012-6687
redhat medium — https://access.redhat.com/security/cve/CVE-2012-6687
ubuntu medium CVE-2012-6687 medium priority: Ubuntu including 1 source packages (libfcgi), 5 status rows across 5 suites (lucid, precise, trusty, upstream, utopic): released 2, DNE 1, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2012-6687

Affected software / configurations for CVE-2012-6687

Vendor Product Version Raw CPE
fastcgi fcgi 2.4.0 cpe:2.3:a:fastcgi:fcgi:2.4.0:*:*:*:*:*:*:*

References for CVE-2012-6687

cvelogic Threat Intelligence