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.
2011-05-13T17:05:43.207
2025-04-11T00:51:21.963
Deferred
CVSSv2: 6.8 (MEDIUM)
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | postfix | postfix | 2.0.0 | Yes |
| Application | postfix | postfix | 2.0.1 | Yes |
| Application | postfix | postfix | 2.0.2 | Yes |
| Application | postfix | postfix | 2.0.3 | Yes |
| Application | postfix | postfix | 2.0.4 | Yes |
| Application | postfix | postfix | 2.0.5 | Yes |
| Application | postfix | postfix | 2.0.6 | Yes |
| Application | postfix | postfix | 2.0.7 | Yes |
| Application | postfix | postfix | 2.0.8 | Yes |
| Application | postfix | postfix | 2.0.9 | Yes |
| Application | postfix | postfix | 2.0.10 | Yes |
| Application | postfix | postfix | 2.0.11 | Yes |
| Application | postfix | postfix | 2.0.12 | Yes |
| Application | postfix | postfix | 2.0.13 | Yes |
| Application | postfix | postfix | 2.0.14 | Yes |
| Application | postfix | postfix | 2.0.15 | Yes |
| Application | postfix | postfix | 2.0.16 | Yes |
| Application | postfix | postfix | 2.0.17 | Yes |
| Application | postfix | postfix | 2.0.18 | Yes |
| Application | postfix | postfix | 2.0.19 | Yes |
| Application | postfix | postfix | 2.1.0 | Yes |
| Application | postfix | postfix | 2.1.1 | Yes |
| Application | postfix | postfix | 2.1.2 | Yes |
| Application | postfix | postfix | 2.1.3 | Yes |
| Application | postfix | postfix | 2.1.4 | Yes |
| Application | postfix | postfix | 2.1.5 | Yes |
| Application | postfix | postfix | 2.1.6 | Yes |
| Application | postfix | postfix | 2.2.0 | Yes |
| Application | postfix | postfix | 2.2.1 | Yes |
| Application | postfix | postfix | 2.2.2 | Yes |
| Application | postfix | postfix | 2.2.3 | Yes |
| Application | postfix | postfix | 2.2.4 | Yes |
| Application | postfix | postfix | 2.2.5 | Yes |
| Application | postfix | postfix | 2.2.6 | Yes |
| Application | postfix | postfix | 2.2.7 | Yes |
| Application | postfix | postfix | 2.2.8 | Yes |
| Application | postfix | postfix | 2.2.9 | Yes |
| Application | postfix | postfix | 2.2.10 | Yes |
| Application | postfix | postfix | 2.2.11 | Yes |
| Application | postfix | postfix | 2.2.12 | Yes |
| Application | postfix | postfix | 2.3 | Yes |
| Application | postfix | postfix | 2.3.0 | Yes |
| Application | postfix | postfix | 2.3.1 | Yes |
| Application | postfix | postfix | 2.3.2 | Yes |
| Application | postfix | postfix | 2.3.3 | Yes |
| Application | postfix | postfix | 2.3.4 | Yes |
| Application | postfix | postfix | 2.3.5 | Yes |
| Application | postfix | postfix | 2.3.6 | Yes |
| Application | postfix | postfix | 2.3.7 | Yes |
| Application | postfix | postfix | 2.3.8 | Yes |
| Application | postfix | postfix | 2.3.9 | Yes |
| Application | postfix | postfix | 2.3.10 | Yes |
| Application | postfix | postfix | 2.3.11 | Yes |
| Application | postfix | postfix | 2.3.12 | Yes |
| Application | postfix | postfix | 2.3.13 | Yes |
| Application | postfix | postfix | 2.3.14 | Yes |
| Application | postfix | postfix | 2.3.15 | Yes |
| Application | postfix | postfix | 2.3.16 | Yes |
| Application | postfix | postfix | 2.3.17 | Yes |
| Application | postfix | postfix | 2.3.18 | Yes |
| Application | postfix | postfix | 2.3.19 | Yes |
| Application | postfix | postfix | 2.4 | Yes |
| Application | postfix | postfix | 2.4.0 | Yes |
| Application | postfix | postfix | 2.4.1 | Yes |
| Application | postfix | postfix | 2.4.2 | Yes |
| Application | postfix | postfix | 2.4.3 | Yes |
| Application | postfix | postfix | 2.4.4 | Yes |
| Application | postfix | postfix | 2.4.5 | Yes |
| Application | postfix | postfix | 2.4.6 | Yes |
| Application | postfix | postfix | 2.4.7 | Yes |
| Application | postfix | postfix | 2.4.8 | Yes |
| Application | postfix | postfix | 2.4.9 | Yes |
| Application | postfix | postfix | 2.4.10 | Yes |
| Application | postfix | postfix | 2.4.11 | Yes |
| Application | postfix | postfix | 2.4.12 | Yes |
| Application | postfix | postfix | 2.4.13 | Yes |
| Application | postfix | postfix | 2.4.14 | Yes |
| Application | postfix | postfix | 2.4.15 | Yes |
| Application | postfix | postfix | 2.5.0 | Yes |
| Application | postfix | postfix | 2.5.1 | Yes |
| Application | postfix | postfix | 2.5.2 | Yes |
| Application | postfix | postfix | 2.5.3 | Yes |
| Application | postfix | postfix | 2.5.4 | Yes |
| Application | postfix | postfix | 2.5.5 | Yes |
| Application | postfix | postfix | 2.5.6 | Yes |
| Application | postfix | postfix | 2.5.7 | Yes |
| Application | postfix | postfix | 2.5.8 | Yes |
| Application | postfix | postfix | 2.5.9 | Yes |
| Application | postfix | postfix | 2.5.10 | Yes |
| Application | postfix | postfix | 2.5.11 | Yes |
| Application | postfix | postfix | 2.5.12 | Yes |
| Application | postfix | postfix | 2.6 | Yes |
| Application | postfix | postfix | 2.6.0 | Yes |
| Application | postfix | postfix | 2.6.1 | Yes |
| Application | postfix | postfix | 2.6.2 | Yes |
| Application | postfix | postfix | 2.6.3 | Yes |
| Application | postfix | postfix | 2.6.4 | Yes |
| Application | postfix | postfix | 2.6.5 | Yes |
| Application | postfix | postfix | 2.6.6 | Yes |
| Application | postfix | postfix | 2.6.7 | Yes |
| Application | postfix | postfix | 2.6.8 | Yes |
| Application | postfix | postfix | 2.6.9 | Yes |
| Application | postfix | postfix | 2.7.0 | Yes |
| Application | postfix | postfix | 2.7.1 | Yes |
| Application | postfix | postfix | 2.7.2 | Yes |
| Application | postfix | postfix | 2.7.3 | Yes |
| Application | postfix | postfix | 2.8.0 | Yes |
| Application | postfix | postfix | 2.8.1 | Yes |
| Application | postfix | postfix | 2.8.2 | Yes |