CVE-2011-4409

CVE-2011-4409 is a high-severity vulnerability in Canonical Ubuntu Linux with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Description

The Ubuntu One Client for Ubuntu 10.04 LTS, 11.04, 11.10, and 12.04 LTS does not properly validate SSL certificates, which allows remote attackers to spoof a server and modify or read sensitive information via a man-in-the-middle (MITM) attack.

Frequently asked questions

What is CVE-2011-4409?
The Ubuntu One Client for Ubuntu 10.04 LTS, 11.04, 11.10, and 12.04 LTS does not properly validate SSL certificates, which allows remote attackers to spoof a server and modify or read sensitive information via a man-in-the-middle (MITM) attack.
How severe is CVE-2011-4409?
CVE-2011-4409 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2011-4409 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4409?
CVE-2011-4409 primarily affects Canonical Ubuntu Linux. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4409?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-4409 published?
CVE-2011-4409 was published on 2012-06-16 and last updated on 2026-06-16.

References

Affected products (4)

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