CVE-2011-1506

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-03-22 · updated 2026-06-16
Weakness: CWE-20

Description

The STARTTLS implementation in Kerio Connect 7.1.4 build 2985 and MailServer 6.x does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411. NOTE: some of these details are obtained from third party information.

Affected products

Kerio Connect: 7.1.4
Kerio Mailserver: 5.0, 5.1, 5.1.1, 5.6.3, 5.6.4, 5.6.5 (+50)

References

http://secunia.com/advisories/43678
http://www.kb.cert.org/vuls/id/555316
http://www.kb.cert.org/vuls/id/MAPG-8D9M4P
http://www.securityfocus.com/bid/46767
http://www.vupen.com/english/advisories/2011/0610
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932
http://secunia.com/advisories/43678
http://www.kb.cert.org/vuls/id/555316
http://www.kb.cert.org/vuls/id/MAPG-8D9M4P
http://www.securityfocus.com/bid/46767
http://www.vupen.com/english/advisories/2011/0610
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932

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