Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the (no argument given) string is appended to the buffer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Exim | University_of_cambridge | 3.0 (including) | 3.0 (including) |
| Exim | University_of_cambridge | 3.3 (including) | 3.3 (including) |
| Exim | University_of_cambridge | 3.3.1 (including) | 3.3.1 (including) |
| Exim | University_of_cambridge | 3.3.2 (including) | 3.3.2 (including) |
| Exim | University_of_cambridge | 3.11 (including) | 3.11 (including) |
| Exim | University_of_cambridge | 3.12 (including) | 3.12 (including) |
| Exim | University_of_cambridge | 3.13 (including) | 3.13 (including) |
| Exim | University_of_cambridge | 3.14 (including) | 3.14 (including) |
| Exim | University_of_cambridge | 3.15 (including) | 3.15 (including) |
| Exim | University_of_cambridge | 3.16 (including) | 3.16 (including) |
| Exim | University_of_cambridge | 3.17 (including) | 3.17 (including) |
| Exim | University_of_cambridge | 3.18 (including) | 3.18 (including) |
| Exim | University_of_cambridge | 3.19 (including) | 3.19 (including) |
| Exim | University_of_cambridge | 3.20 (including) | 3.20 (including) |
| Exim | University_of_cambridge | 3.21 (including) | 3.21 (including) |
| Exim | University_of_cambridge | 3.22 (including) | 3.22 (including) |
| Exim | University_of_cambridge | 3.30 (including) | 3.30 (including) |
| Exim | University_of_cambridge | 3.31 (including) | 3.31 (including) |
| Exim | University_of_cambridge | 3.32 (including) | 3.32 (including) |
| Exim | University_of_cambridge | 3.33 (including) | 3.33 (including) |
| Exim | University_of_cambridge | 3.34 (including) | 3.34 (including) |
| Exim | University_of_cambridge | 3.35 (including) | 3.35 (including) |
| Exim | University_of_cambridge | 3.36 (including) | 3.36 (including) |
| Exim | University_of_cambridge | 4.10 (including) | 4.10 (including) |
| Exim | University_of_cambridge | 4.20 (including) | 4.20 (including) |