UpHeron
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Servers and applications

CVE-2011-1720

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…

Severity
Medium 6.8
Published
13 May 2011
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
22% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Memory buffer errors (CWE-119)
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

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.

From NVD.

Affected software

SoftwareAffected versions
PostfixServers and applications · cpe:a:postfix:postfix
  • Version 2.8.2
  • Version 2.8.1
  • Version 2.8.0
  • Version 2.7.3
All 106 release lines
  • Version 2.0.0
  • Version 2.0.1
  • Version 2.0.2
  • Version 2.0.3
  • Version 2.0.4
  • Version 2.0.5
  • Version 2.0.6
  • Version 2.0.7
  • Version 2.0.8
  • Version 2.0.9
  • Version 2.0.10
  • Version 2.0.11
  • Version 2.0.12
  • Version 2.0.13
  • Version 2.0.14
  • Version 2.0.15
  • Version 2.0.16
  • Version 2.0.17
  • Version 2.0.18
  • Version 2.0.19
  • Version 2.1.0
  • Version 2.1.1
  • Version 2.1.2
  • Version 2.1.3
  • Version 2.1.4
  • Version 2.1.5
  • Version 2.1.6
  • Version 2.2.0
  • Version 2.2.1
  • Version 2.2.2
  • Version 2.2.3
  • Version 2.2.4
  • Version 2.2.5
  • Version 2.2.6
  • Version 2.2.7
  • Version 2.2.8
  • Version 2.2.9
  • Version 2.2.10
  • Version 2.2.11
  • Version 2.2.12
  • Version 2.3
  • Version 2.3.1
  • Version 2.3.2
  • Version 2.3.3
  • Version 2.3.4
  • Version 2.3.5
  • Version 2.3.6
  • Version 2.3.7
  • Version 2.3.8
  • Version 2.3.9
  • Version 2.3.10
  • Version 2.3.11
  • Version 2.3.12
  • Version 2.3.13
  • Version 2.3.14
  • Version 2.3.15
  • Version 2.3.16
  • Version 2.3.17
  • Version 2.3.18
  • Version 2.3.19
  • Version 2.4
  • Version 2.4.1
  • Version 2.4.2
  • Version 2.4.3
  • Version 2.4.4
  • Version 2.4.5
  • Version 2.4.6
  • Version 2.4.7
  • Version 2.4.8
  • Version 2.4.9
  • Version 2.4.10
  • Version 2.4.11
  • Version 2.4.12
  • Version 2.4.13
  • Version 2.4.14
  • Version 2.4.15
  • Version 2.5.0
  • Version 2.5.1
  • Version 2.5.2
  • Version 2.5.3
  • Version 2.5.4
  • Version 2.5.5
  • Version 2.5.6
  • Version 2.5.7
  • Version 2.5.8
  • Version 2.5.9
  • Version 2.5.10
  • Version 2.5.11
  • Version 2.5.12
  • Version 2.6
  • Version 2.6.1
  • Version 2.6.2
  • Version 2.6.3
  • Version 2.6.4
  • Version 2.6.5
  • Version 2.6.6
  • Version 2.6.7
  • Version 2.6.8
  • Version 2.6.9
  • Version 2.7.0
  • Version 2.7.1
  • Version 2.7.2
  • Version 2.7.3
  • Version 2.8.0
  • Version 2.8.1
  • Version 2.8.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-1720
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-1720