CVE-2013-2131: Format string vulnerability in the rrdtool module 1.4.7 for Python, as used in Zenoss, allows context-dependen

Q: How do I fix CVE-2013-2131?

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

Q: Is CVE-2013-2131 being exploited?

CVE-2013-2131 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-2013-2131 affect?

CVE-2013-2131 affects rrdtool. Severity is medium (CVSS 5.0). Format string vulnerability in the rrdtool module 1.4.7 for Python, as used in Zenoss, allows context-dependent attackers to cause a denial of service (crash) via format string specifiers to the rrdtool.graph function.

Q: How urgent is CVE-2013-2131?

Priority 46/100. EPSS top 4%: very likely to be exploited; Public exploit reference

This week

MEDIUM 5.0DOWNGRADE

CVE-2013-2131 is a medium-severity flaw (CVSS 5.0) affecting rrdtool. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in the rrdtool module 1.4.7 for Python, as used in Zenoss, allows context-dependent attackers to cause a denial of service (crash) via format string specifiers to the rrdtool.graph function.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	10.6% (top 4%)
CISA exploited list	No
Weakness	CWE-134
Published	2015-01-04
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: rrdtool project

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

Am I affected?

Timeline

2015-01-04 21:59 UTCPublished CVE record published
2026-06-16 23:52 UTCUpdated Record last modified

rrdtool project rrdtool DOWNGRADE

Affected: 1.4.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.7

1. Check installed version

pip show rrdtool

2. No fixed release: DOWNGRADE to a release before 1.4.7

pip index versions rrdtool pip install "rrdtool<1.4.7"

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: Python RRDtool Module - Function Format String

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-2013-2131?

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

Is CVE-2013-2131 being exploited?

CVE-2013-2131 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-2013-2131 affect?

CVE-2013-2131 affects rrdtool. Severity is medium (CVSS 5.0). Format string vulnerability in the rrdtool module 1.4.7 for Python, as used in Zenoss, allows context-dependent attackers to cause a denial of service (crash) via format string specifiers to the rrdtool.graph function.

How urgent is CVE-2013-2131?

Priority 46/100. EPSS top 4%: very likely to be exploited; Public exploit reference

Software pages

Python vulnerabilities

References

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