Public Date:
699035: CVE-2011-1720 postfix (smtpd): Crash due to improper management of SASL handlers for SMTP sessions

The MITRE CVE dictionary describes this issue as:

The SMTP server in Postfix before 2.5.13, 2.6.x before 2.6.10, 2.7.x before 2.7.4, and 2.8.x before 2.8.3, when certain Cyrus SASL authentication methods are enabled, does not create a new server handle after client authentication fails, which allows remote attackers to cause a denial of service (heap memory corruption and daemon crash) or possibly execute arbitrary code via an invalid AUTH command with one method followed by an AUTH command with a different method.

Find out more about CVE-2011-1720 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 4.3
Base Metrics AV:N/AC:M/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 6 (postfix) RHSA-2011:0843 2011-05-31
Red Hat Enterprise Linux 4 (postfix) RHSA-2011:0843 2011-05-31
Red Hat Enterprise Linux 5 (postfix) RHSA-2011:0843 2011-05-31


Red Hat would like to thank the CERT/CC for reporting CVE-2011-1720. Upstream acknowledges Thomas Jarosch of Intra2net AG as the original reporter.

Last Modified

CVE description copyright © 2017, The MITRE Corporation


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