How severe is CVE-2019-16791?

CVE-2019-16791 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2019-16791 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16791?

CVE-2019-16791 affects Postfix-mta-sts-resolver Project Postfix-mta-sts-resolver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16791?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-16791 published?

CVE-2019-16791 was published on 2020-01-22 and last updated on 2026-06-17.

CVE-2019-16791

CVE-2019-16791 is a medium-severity vulnerability in Postfix-mta-sts-resolver Project Postfix-mta-sts-resolver with a CVSS 3.x base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-757.

Key facts

Severity: Medium (CVSS 3.x base score 6.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-757
Affected product: Postfix-mta-sts-resolver Project Postfix-mta-sts-resolver
Published: 2020-01-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2019-16791?: 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 severe is CVE-2019-16791?: CVE-2019-16791 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2019-16791 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16791?: CVE-2019-16791 affects Postfix-mta-sts-resolver Project Postfix-mta-sts-resolver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16791?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16791 published?: CVE-2019-16791 was published on 2020-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:postfix-mta-sts-resolver_project:postfix-mta-sts-resolver:*:*:*:*:*:*:*:*

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