PatchTheCVECVE-2006-0977: Craig Morrison Mail Transport System Professional (aka MTS Pro) acts as an open relay when configured to relay
CVE-2006-0977 is a medium-severity flaw (CVSS 5.0) affecting mts pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Craig Morrison Mail Transport System Professional (aka MTS Pro) acts as an open relay when configured to relay all mail through an external SMTP server, which allows remote attackers to relay mail by connecting to the MTS Pro server, then sending a MAIL FROM that specifies a domain that is local to the server.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.0 (Medium) |
| EPSS exploit chance | 1.7% (top 23%) |
| CISA exploited list | No |
| Published | 2006-03-03 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2006-0977?
mts pro: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2006-0977 being exploited?
CVE-2006-0977 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2006-0977 affect?
CVE-2006-0977 affects mts pro. Severity is medium (CVSS 5.0). Craig Morrison Mail Transport System Professional (aka MTS Pro) acts as an open relay when configured to relay all mail through an external SMTP server, which allows remote attackers to relay mail by connecting to the MTS Pro server, then s
How urgent is CVE-2006-0977?
Priority 37/100. No elevated risk signals yet.