CVE-2018-20954: The "Security and Privacy" Encryption feature in Mailpile before 1.0.0rc4 does not exclude disabled, revoked,

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-20954 is a high-severity flaw (CVSS 7.5) affecting mailpile. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The "Security and Privacy" Encryption feature in Mailpile before 1.0.0rc4 does not exclude disabled, revoked, and expired keys.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Weakness	CWE-287
Published	2019-08-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mailpile

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-08-08 21:15 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

mailpile mailpile DOWNGRADE

Affected: 0.5.0 · 0.5.1 · 0.5.2 · 1.0.0 rc0 · 1.0.0 rc1 · 1.0.0 rc2 · 1.0.0 rc3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.0

1. Check installed version

apt-cache policy mailpile || rpm -q mailpile || mailpile --version

2. No fixed release: DOWNGRADE to a release before 0.5.0 (Debian / Ubuntu)

apt-cache madison mailpile sudo apt install mailpile=<VERSION_BEFORE_0.5.0> sudo apt-mark hold mailpile

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mailpile sudo dnf downgrade mailpile-<VERSION_BEFORE_0.5.0> sudo dnf versionlock add mailpile

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2018-20954?

mailpile: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20954 being exploited?

CVE-2018-20954 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-2018-20954 affect?

CVE-2018-20954 affects mailpile. Severity is high (CVSS 7.5). The "Security and Privacy" Encryption feature in Mailpile before 1.0.0rc4 does not exclude disabled, revoked, and expired keys.

How urgent is CVE-2018-20954?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

References

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