Is CVE-2011-1156 in the CISA KEV catalog?

No. CVE-2011-1156 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1156?

CVE-2011-1156 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-1156?

CVE-2011-1156 has an EPSS score of 3.23% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-1156?

Upgrade feedparser on debian 11 to 5.0.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-1156

MEDIUMEPSS 87th pctl

5.0

CVSS v2

NVD

Description

feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0.1 allows remote attackers to cause a denial of service (application crash) via a malformed DOCTYPE declaration.

CWE-399Resource Management Errors

How to fix

Remediation Available

feedparserDebian

Fixed in:5.0.1-1CVE-2011-1156

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

3.23%probability of exploitation in 30 days

87thpercentile

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

References

Patch4

Vendor Advisory2

Other references5

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	Fix

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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.