CVE-2015-3406: The PGP signature parsing in Module::Signature before 0.74 allows remote attackers to cause the unsigned porti

Q: How do I fix CVE-2015-3406?

module-signature: upgrade to 0.74; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2015-3406 being exploited?

CVE-2015-3406 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-3406 affect?

CVE-2015-3406 affects module-signature, ubuntu linux. Severity is high (CVSS 7.5). The PGP signature parsing in Module::Signature before 0.74 allows remote attackers to cause the unsigned portion of a SIGNATURE file to be treated as the signed portion via unspecified vectors.

Q: How urgent is CVE-2015-3406?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2015-3406 is a high-severity flaw (CVSS 7.5) affecting module-signature, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The PGP signature parsing in Module::Signature before 0.74 allows remote attackers to cause the unsigned portion of a SIGNATURE file to be treated as the signed portion via unspecified vectors.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-681
Published	2019-11-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · module-signature project

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

Am I affected?

Timeline

2019-11-29 21:15 UTCPublished CVE record published
2026-06-17 00:25 UTCUpdated Record last modified

module-signature project module-signature UPGRADE

Affected: < 0.74

Fixed in: 0.74

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy module-signature || rpm -q module-signature || module-signature --version

2. UPGRADE to 0.74 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade module-signature

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade module-signature

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

canonical ubuntu linux MITIGATE

Affected: 12.04 · 14.04 · 14.10 · 15.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2015-3406?

module-signature: upgrade to 0.74; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-3406 being exploited?

CVE-2015-3406 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-2015-3406 affect?

CVE-2015-3406 affects module-signature, ubuntu linux. Severity is high (CVSS 7.5). The PGP signature parsing in Module::Signature before 0.74 allows remote attackers to cause the unsigned portion of a SIGNATURE file to be treated as the signed portion via unspecified vectors.

How urgent is CVE-2015-3406?

Priority 57/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities

References

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