CVE-2012-2104: cgi-bin/munin-cgi-graph in Munin 2.x writes data to a log file without sanitizing non-printable characters, wh

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MEDIUM 6.8DOWNGRADE

CVE-2012-2104 is a medium-severity flaw (CVSS 6.8) affecting munin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

cgi-bin/munin-cgi-graph in Munin 2.x writes data to a log file without sanitizing non-printable characters, which might allow user-assisted remote attackers to inject terminal emulator escape sequences and execute arbitrary commands or delete arbitrary files via a crafted HTTP request.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	5.1% (top 8%)
CISA exploited list	No
Weakness	CWE-20
Published	2012-08-26
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: munin-monitoring

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

Am I affected?

Timeline

2012-08-26 21:55 UTCPublished CVE record published
2026-06-16 23:40 UTCUpdated Record last modified

munin-monitoring munin DOWNGRADE

Affected: 2.0 · 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison munin sudo apt install munin=<VERSION_BEFORE_2.0> sudo apt-mark hold munin

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

dnf --showduplicates list munin sudo dnf downgrade munin-<VERSION_BEFORE_2.0> sudo dnf versionlock add munin

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Munin 2.0~rc4-1 - Remote Command Injection

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-2012-2104?

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

Is CVE-2012-2104 being exploited?

CVE-2012-2104 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-2012-2104 affect?

CVE-2012-2104 affects munin. Severity is medium (CVSS 6.8). cgi-bin/munin-cgi-graph in Munin 2.x writes data to a log file without sanitizing non-printable characters, which might allow user-assisted remote attackers to inject terminal emulator escape sequences and execute arbitrary commands or dele

How urgent is CVE-2012-2104?

Priority 52/100. EPSS top 8%: very likely to be exploited; Public exploit reference

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References

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