CVE-2013-2145: The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to byp

Q: How do I fix CVE-2013-2145?

ubuntu linux: mitigate or apply the listed mitigation; opensuse: mitigate or apply the listed mitigation; module\: upgrade to newer than 0.72. Exact commands for each OS are on this page.

Q: Is CVE-2013-2145 being exploited?

CVE-2013-2145 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-2013-2145 affect?

CVE-2013-2145 affects ubuntu linux, opensuse, module\. Severity is medium (CVSS 4.4). The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to bypass the signature check and execute arbitrary code via a SIGNATURE file with a "special unknown cipher" that references an untrust

Q: How urgent is CVE-2013-2145?

Priority 37/100. Public exploit reference; On your watchlist

Routine

MEDIUM 4.4WATCHLISTMITIGATEMITIGATEUPGRADE

CVE-2013-2145 is a medium-severity flaw (CVSS 4.4) affecting ubuntu linux, opensuse, module\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to bypass the signature check and execute arbitrary code via a SIGNATURE file with a "special unknown cipher" that references an untrusted module in Digest/.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-20
Published	2013-08-19
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: canonical · opensuse · perlmonks

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

Am I affected?

Timeline

2013-08-19 23:55 UTCPublished CVE record published
2026-06-16 23:52 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 12.04 · 12.10 · 13.04

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.

opensuse opensuse MITIGATE

Affected: 11.4 · 12.2 · 12.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.4

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.

perlmonks module\ UPGRADE

Affected: <= 0.72 · \ signature

Fixed in: newer than 0.72

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.72 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade module

Note

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

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-2013-2145?

ubuntu linux: mitigate or apply the listed mitigation; opensuse: mitigate or apply the listed mitigation; module\: upgrade to newer than 0.72. Exact commands for each OS are on this page.

Is CVE-2013-2145 being exploited?

CVE-2013-2145 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-2013-2145 affect?

CVE-2013-2145 affects ubuntu linux, opensuse, module\. Severity is medium (CVSS 4.4). The cpansign verify functionality in the Module::Signature module before 0.72 for Perl allows attackers to bypass the signature check and execute arbitrary code via a SIGNATURE file with a "special unknown cipher" that references an untrust

How urgent is CVE-2013-2145?

Priority 37/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities · Perl vulnerabilities

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References

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