Is CVE-2011-4940 in the CISA KEV catalog?

No. CVE-2011-4940 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4940?

CVE-2011-4940 has a CVSS v2 base score of 2.6 (LOW).

What is the EPSS score for CVE-2011-4940?

CVE-2011-4940 has an EPSS score of 3.21% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4940?

Upgrade python2.7 on debian 11 to 2.7.2-8 or later.

CVE & CISA-KEV Catalog

CVE-2011-4940

LOWEPSS 87th pctl

2.6

CVSS v2

NVD

Description

The list_directory function in Lib/SimpleHTTPServer.py in SimpleHTTPServer in Python before 2.5.6c1, 2.6.x before 2.6.7 rc2, and 2.7.x before 2.7.2 does not place a charset parameter in the Content-Type HTTP header, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks against Internet Explorer 7 via UTF-7 encoding.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

python2.7Debian

Fixed in:2.7.2-8CVE-2011-4940

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

3.21%probability of exploitation in 30 days

87thpercentile

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

References

Other references12

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	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.