Is CVE-2011-3607 in the CISA KEV catalog?

No. CVE-2011-3607 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-3607?

CVE-2011-3607 has a CVSS v2 base score of 4.4 (MEDIUM).

What is the EPSS score for CVE-2011-3607?

CVE-2011-3607 has an EPSS score of 4.72% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-3607?

Upgrade apache2 on debian 11 to 2.2.21-4 or later.

CVE & CISA-KEV Catalog

CVE-2011-3607

MEDIUMEPSS 91th pctl

4.4

CVSS v2

NVD

Description

Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.

CWE-189

How to fix

Remediation Available

apache2Debian

Fixed in:2.2.21-4CVE-2011-3607

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.72%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Related Vulnerabilities

Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1538	High	10.0	99%	-	-
CVE-2006-3747	High	7.6	96%	-	Fix
CVE-2007-0071	High	9.3	93%	-	-
CVE-2015-3829	High	10.0	90%	-	-
CVE-2015-3864	High	10.0	87%	-	-
CVE-2015-1539	High	10.0	86%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.