CVE-2017-6188: Munin before 2.999.6 has a local file write vulnerability when CGI graphs are enabled

Routine

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2017-6188 is a medium-severity flaw (CVSS 5.5) affecting munin, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Munin before 2.999.6 has a local file write vulnerability when CGI graphs are enabled. Setting multiple upper_limit GET parameters allows overwriting any file accessible to the www-data user.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-02-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · munin-monitoring

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

Am I affected?

Timeline

2017-02-22 19:59 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

munin-monitoring munin UPGRADE

Affected: < 2.0.30.1 · >= 2.1.0 and < 2.999.9

Fixed in: 2.0.30.1, 2.999.9

Safe to downgrade to: a release before 2.1.0

1. Check installed version

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

2. UPGRADE to 2.0.30.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade munin

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 2.1.0 (Debian / Ubuntu)

apt-cache madison munin sudo apt install munin=<VERSION_BEFORE_2.1.0> sudo apt-mark hold munin

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

dnf --showduplicates list munin sudo dnf downgrade munin-<VERSION_BEFORE_2.1.0> 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.

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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-2017-6188?

munin: upgrade to 2.0.30.1, 2.999.9; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-6188 being exploited?

CVE-2017-6188 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-2017-6188 affect?

CVE-2017-6188 affects munin, debian linux. Severity is medium (CVSS 5.5). Munin before 2.999.6 has a local file write vulnerability when CGI graphs are enabled. Setting multiple upper_limit GET parameters allows overwriting any file accessible to the www-data user.

How urgent is CVE-2017-6188?

Priority 33/100. On your watchlist

Software pages

Debian vulnerabilities

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References

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