CVE-2019-16791

Q: How do I fix CVE-2019-16791?

Upgrade postfix-mta-sts-resolver to 0.5.1 or later.

Q: Is CVE-2019-16791 being actively exploited?

Not that we know of. CVE-2019-16791 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 54% of all scored CVEs.

Q: How severe is CVE-2019-16791?

CVE-2019-16791 has a CVSS v3 base score of 6.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2019-16791 affect?

Published advisories record a fix for postfix-mta-sts-resolver (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

6.9

CVSS v3

NVD

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.

CWE-757

How to fix

Remediation Available

postfix-mta-sts-resolverNVD

Affected:< 0.5.1Fixed in:0.5.1CVE-2019-16791derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Exploit Intelligence

0.78%probability of exploitation in 30 days

54thpercentile

Moderate risk: more likely to be exploited than 54% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-757 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-10135	Medium	5.4	2.4%	-	Fix
CVE-2017-9269	High	7.7	2.2%	-	Fix
CVE-2021-36326	Medium	6.5	1.2%	-	Fix
CVE-2025-24154	Critical	9.1	1.2%	-	Fix
CVE-2019-14887	Critical	9.1	1.1%	-	-
CVE-2017-9267	Medium	6.5	1.0%	-	Fix

Common questions

How do I fix CVE-2019-16791?

Upgrade postfix-mta-sts-resolver to 0.5.1 or later.

Is CVE-2019-16791 being actively exploited?

Not that we know of. CVE-2019-16791 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 54% of all scored CVEs.

How severe is CVE-2019-16791?

CVE-2019-16791 has a CVSS v3 base score of 6.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-16791 affect?

Published advisories record a fix for postfix-mta-sts-resolver (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.