Is CVE-2011-2721 in the CISA KEV catalog?

No. CVE-2011-2721 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-2721?

CVE-2011-2721 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-2721?

CVE-2011-2721 has an EPSS score of 3.38% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-2721?

Upgrade clamav on debian 11 to 0.97.2+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-2721

MEDIUMEPSS 87th pctl

5.0

CVSS v2

NVD

Description

Off-by-one error in the cli_hm_scan function in matcher-hash.c in libclamav in ClamAV before 0.97.2 allows remote attackers to cause a denial of service (daemon crash) via an e-mail message that is not properly handled during certain hash calculations.

CWE-189

How to fix

Remediation Available

clamavDebian

Fixed in:0.97.2+dfsg-1CVE-2011-2721

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

3.38%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch5

Vendor Advisory1

secunia.com

Other references12

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.