CVE-2013-0191: libpam-pgsql (aka pam_pgsql) 0.7 does not properly handle a NULL value returned by the password search query,

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MEDIUM 5.0DOWNGRADE

CVE-2013-0191 is a medium-severity flaw (CVSS 5.0) affecting libpam-pgsql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libpam-pgsql (aka pam_pgsql) 0.7 does not properly handle a NULL value returned by the password search query, which allows remote attackers to bypass authentication via a crafted password.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-287
Published	2014-06-03
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: lucas clemente vella

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

Am I affected?

Timeline

2014-06-03 14:55 UTCPublished CVE record published
2026-06-16 23:48 UTCUpdated Record last modified

lucas clemente vella libpam-pgsql DOWNGRADE

Affected: 0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7

1. Check installed version

apt-cache policy libpam-pgsql || rpm -q libpam-pgsql || libpam-pgsql --version

2. No fixed release: DOWNGRADE to a release before 0.7 (Debian / Ubuntu)

apt-cache madison libpam-pgsql sudo apt install libpam-pgsql=<VERSION_BEFORE_0.7> sudo apt-mark hold libpam-pgsql

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

dnf --showduplicates list libpam-pgsql sudo dnf downgrade libpam-pgsql-<VERSION_BEFORE_0.7> sudo dnf versionlock add libpam-pgsql

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-2013-0191?

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

Is CVE-2013-0191 being exploited?

CVE-2013-0191 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-2013-0191 affect?

CVE-2013-0191 affects libpam-pgsql. Severity is medium (CVSS 5.0). libpam-pgsql (aka pam_pgsql) 0.7 does not properly handle a NULL value returned by the password search query, which allows remote attackers to bypass authentication via a crafted password.

How urgent is CVE-2013-0191?

Priority 42/100. Public exploit reference

References

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