How severe is CVE-2012-6687?

CVE-2012-6687 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2012-6687 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-6687?

CVE-2012-6687 affects Fastcgi Fcgi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-6687?

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

When was CVE-2012-6687 published?

CVE-2012-6687 was published on 2015-02-19 and last updated on 2026-06-16.

CVE-2012-6687

CVE-2012-6687 is a medium-severity vulnerability in Fastcgi Fcgi with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Fastcgi Fcgi
Published: 2015-02-19
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2012-6687?: CVE-2012-6687 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2012-6687 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-6687?: CVE-2012-6687 affects Fastcgi Fcgi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-6687?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-6687 published?: CVE-2012-6687 was published on 2015-02-19 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:fastcgi:fcgi:2.4.0:*:*:*:*:*:*:*

More vulnerabilities in Fastcgi Fcgi

CVE-2025-40907 — Medium (CVSS 5.3): FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The…

All CVEs affecting Fastcgi Fcgi →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →