report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.
The product does not initialize a critical resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fetchmail | Fetchmail | * | 6.4.20 (excluding) |