CVE-2011-4919: mpack 1.6 has information disclosure via eavesdropping on mails sent by other users

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2011-4919 is a high-severity flaw (CVSS 7.5) affecting mpack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mpack 1.6 has information disclosure via eavesdropping on mails sent by other users

Why this priority

High severity
Public exploit reference
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	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-200
Published	2019-11-19
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: mpack project

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-11-19 16:15 UTCPublished CVE record published
2026-06-16 23:35 UTCUpdated Record last modified

mpack project mpack DOWNGRADE

Affected: 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.6 (Debian / Ubuntu)

apt-cache madison mpack sudo apt install mpack=<VERSION_BEFORE_1.6> sudo apt-mark hold mpack

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

dnf --showduplicates list mpack sudo dnf downgrade mpack-<VERSION_BEFORE_1.6> sudo dnf versionlock add mpack

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-2011-4919?

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

Is CVE-2011-4919 being exploited?

CVE-2011-4919 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-2011-4919 affect?

CVE-2011-4919 affects mpack. Severity is high (CVSS 7.5). mpack 1.6 has information disclosure via eavesdropping on mails sent by other users

How urgent is CVE-2011-4919?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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