CVE Tools
Sign in

CVE-2011-1506

Published: Mar 22, 2011Updated: Apr 29, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
6.8CVSSMEDIUM
EPSS Score
2.5%
Top 17.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:MAu:NC:PI:PA:P
Exploitability
AV:NAccess Vector
Network
AC:MAccess Complexity
Medium
Au:NAuthentication
None
Impact
C:PConfidentiality
Partial
I:PIntegrity
Partial
A:PAvailability
Partial
Open in CVSS calculator →

Weaknesses

CWE-20

Affected Products

n/an/a
connectkerio
Mixed
Networking Infrastructure / firewall
kerio mailserverkerio
Mixed
Networking Infrastructure / firewall
keriocommercialFINetworking Infrastructureaka kerio technologies

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

http://www.kb.cert.org/vuls/id/MAPG-8D9M4P
kb.cert.org
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932
exchange.xforce.ibmcloud.com
http://www.vupen.com/english/advisories/2011/0610
vupen.com
and 3 more references View all →

Timeline

Published
Mar 22, 2011
Last Updated
Apr 29, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2011-1506 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows