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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 1.74% probability · 78th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- canonical/ubuntu linux
- Source
- security@ubuntu.com
EPSS 1.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://secunia.com/advisories/49442Vendor Advisory
- http://ubuntu.com/usn/usn-1465-1Vendor Advisory
- http://ubuntu.com/usn/usn-1465-2Vendor Advisory
- http://ubuntu.com/usn/usn-1465-3
- http://www.osvdb.org/82748
- http://www.securityfocus.com/bid/53828
- https://exchange.xforce.ibmcloud.com/vulnerabilities/76113
- http://secunia.com/advisories/49442Vendor Advisory
- http://ubuntu.com/usn/usn-1465-1Vendor Advisory
- http://ubuntu.com/usn/usn-1465-2Vendor Advisory
- http://ubuntu.com/usn/usn-1465-3
- http://www.osvdb.org/82748
- http://www.securityfocus.com/bid/53828
- https://exchange.xforce.ibmcloud.com/vulnerabilities/76113
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.