CVE-2019-16791
downgrade of effective Strict Transport Security (STS) policy in postfix-mta-sts-resolver
MEDIUM
5.9
CVSS Score
Published: January 22, 2020 at 01:40 AM UTC
Updated: June 17, 2026 at 02:22 AM UTC
2 products affected across 2 vendorsPostfix Mta Sts ResolverMta Sts Resolver Project Postfix Mta Sts Resolver
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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.9%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 0.5.1
Affected range stops below 0.5.1, so it looks safe — our inference, not a vendor statement
v < 0.5.1
Affected range stops below 0.5.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6bx_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6CVSS
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-757NVD-CWE-Other
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