CVE-2015-2079: Usermin 0.980 through 1.x before 1.660 allows uconfig_save.cgi sig_file_free remote code execution because it

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CRITICAL 9.9UPGRADE

CVE-2015-2079 is a critical-severity flaw (CVSS 9.9) affecting usermin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Usermin 0.980 through 1.x before 1.660 allows uconfig_save.cgi sig_file_free remote code execution because it uses the two argument (not three argument) form of Perl open.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-96, CWE-94
Published	2025-04-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webmin

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

Am I affected?

Timeline

2025-04-28 15:15 UTCPublished CVE record published
2026-06-17 00:23 UTCUpdated Record last modified

webmin usermin UPGRADE

Affected: >= 0.980 and < 1.660

Fixed in: 1.660

Safe to downgrade to: a release before 0.980

1. Check installed version

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

2. UPGRADE to 1.660 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade usermin

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.980 (Debian / Ubuntu)

apt-cache madison usermin sudo apt install usermin=<VERSION_BEFORE_0.980> sudo apt-mark hold usermin

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list usermin sudo dnf downgrade usermin-<VERSION_BEFORE_0.980> sudo dnf versionlock add usermin

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-2015-2079?

usermin: upgrade to 1.660. Exact commands for each OS are on this page.

Is CVE-2015-2079 being exploited?

CVE-2015-2079 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-2015-2079 affect?

CVE-2015-2079 affects usermin. Severity is critical (CVSS 9.9). Usermin 0.980 through 1.x before 1.660 allows uconfig_save.cgi sig_file_free remote code execution because it uses the two argument (not three argument) form of Perl open.

How urgent is CVE-2015-2079?

Priority 58/100. Critical severity; Public exploit reference

Software pages

Perl vulnerabilities

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References

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