Is CVE-2011-4408 being actively exploited?

CVE-2011-4408 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-4408?

CVE-2011-4408 has a CVSS 2.0 base score of 6.8 (MEDIUM).

CVE-2011-4408

MEDIUM · CVSS 6.8EPSS 1.2%EU EUVD

The Single Sign On Client (ubuntu-sso-client) for Ubuntu 11.04 and 11.10 does not properly validate SSL certificates when using HTTPS, which allows remote attackers to spoof a server and modify or read sensitive data via a man-in-the-middle (MITM) attack.

Key facts

CVSS score: 6.8 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS score: 1.2% (69th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-4337)
Published: June 16, 2012
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-4337 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux

References

http://osvdb.org/82747
http://secunia.com/advisories/49448(Vendor Advisory)
http://www.securityfocus.com/bid/53829
http://www.ubuntu.com/usn/USN-1464-1(Patch, Vendor Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/76112

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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