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 | 3.0 |
| Exim | University_of_cambridge | 3.3 | 3.3 |
| Exim | University_of_cambridge | 3.3.1 | 3.3.1 |
| Exim | University_of_cambridge | 3.3.2 | 3.3.2 |
| Exim | University_of_cambridge | 3.11 | 3.11 |
| Exim | University_of_cambridge | 3.12 | 3.12 |
| Exim | University_of_cambridge | 3.13 | 3.13 |
| Exim | University_of_cambridge | 3.14 | 3.14 |
| Exim | University_of_cambridge | 3.15 | 3.15 |
| Exim | University_of_cambridge | 3.16 | 3.16 |
| Exim | University_of_cambridge | 3.17 | 3.17 |
| Exim | University_of_cambridge | 3.18 | 3.18 |
| Exim | University_of_cambridge | 3.19 | 3.19 |
| Exim | University_of_cambridge | 3.20 | 3.20 |
| Exim | University_of_cambridge | 3.21 | 3.21 |
| Exim | University_of_cambridge | 3.22 | 3.22 |
| Exim | University_of_cambridge | 3.30 | 3.30 |
| Exim | University_of_cambridge | 3.31 | 3.31 |
| Exim | University_of_cambridge | 3.32 | 3.32 |
| Exim | University_of_cambridge | 3.33 | 3.33 |
| Exim | University_of_cambridge | 3.34 | 3.34 |
| Exim | University_of_cambridge | 3.35 | 3.35 |
| Exim | University_of_cambridge | 3.36 | 3.36 |
| Exim | University_of_cambridge | 4.10 | 4.10 |
| Exim | University_of_cambridge | 4.20 | 4.20 |