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CVE-2011-1506

21
FAUCET Score

CVE-2011-1506 describes a plaintext command injection vulnerability in the STARTTLS implementation of Kerio Connect 7.1.4 and MailServer 6.x. This flaw allows man-in-the-middle attackers to insert cleartext commands into encrypted SMTP sessions due to improper I/O buffering. The vulnerability has a CVSS score of 6.8, indicating a medium severity risk with network access, medium attack complexity, and potential for partial confidentiality, integrity, and availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
7.1.4CPE matchmatch criteria
cpe:2.3:a:kerio:connect:7.1.4:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.0:*:*:*:*:*:*:*
5.1CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.1:*:*:*:*:*:*:*
5.1.1CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.1.1:*:*:*:*:*:*:*
5.6.3CPE matchmatch criteria
cpe:2.3:a:kerio:kerio_mailserver:5.6.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.47%
Probability of exploitation in next 30 days
EPSS Percentile
82.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0247 is in the 73rd percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

secunia.com / advisories/43678
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/65932
kb.cert.org / vuls/id/555316
US Government Resource
kb.cert.org / vuls/id/MAPG-8D9M4P
US Government Resource
securityfocus.com / bid/46767
vupen.com / english/advisories/2011/0610
Vendor Advisory