PatchTheCVECVE-2019-16791: In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare cond
CVE-2019-16791 is a medium-severity flaw (CVSS 6.9) affecting postfix-mta-sts-resolver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.9 (Medium) |
| Attack vector | Local |
| Attack complexity | High |
| Privileges needed | High |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-757 |
| Published | 2020-01-22 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · 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-2019-16791?
postfix-mta-sts-resolver: upgrade to 0.5.1. Exact commands for each OS are on this page.
Is CVE-2019-16791 being exploited?
CVE-2019-16791 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-2019-16791 affect?
CVE-2019-16791 affects postfix-mta-sts-resolver. Severity is medium (CVSS 6.9). In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.
How urgent is CVE-2019-16791?
Priority 39/100. No elevated risk signals yet.