CVE-2011-1720

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 21.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-05-13 · updated 2026-06-16
Weakness: CWE-119

Description

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.

Affected products

Postfix: 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5 (+103)

References

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00002.html
http://secunia.com/advisories/44500
http://security.gentoo.org/glsa/glsa-201206-33.xml
http://securityreason.com/securityalert/8247
http://www.debian.org/security/2011/dsa-2233
http://www.kb.cert.org/vuls/id/727230
http://www.mail-archive.com/postfix-announce%40postfix.org/msg00007.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:090
http://www.osvdb.org/72259
http://www.postfix.org/CVE-2011-1720.html
http://www.postfix.org/announcements/postfix-2.8.3.html

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