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Fencer Vulns
high 7.3

CVE-2020-6581 json

Nagios NRPE 3.2.1 has Insufficient Filtering because, for example, nasty_metachars interprets \n as the character \ and the character n (no…

published 2020-03-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27729

cvss
7.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

Nagios NRPE 3.2.1 has Insufficient Filtering because, for example, nasty_metachars interprets \n as the character \ and the character n (not as the \n newline sequence). This can cause command injection.

Patch / fix

  • nagios-nrpe Debian 14, Debian 13, Debian 12 4.0.0-1

debian advisories DEBIAN-CVE-2020-6581

  • nrpe Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 4.0.0-r0

alpine advisories ALPINE-CVE-2020-6581

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-6581 updated cvss 7.3

nrpe: insufficient filtering and incorrect parsing of the configuration file may lead to command injection

  • Red Hat Storage 3 nrpe, nagios-plugins-nrpe
    not affected: vulnerable code not present “Disable nasty_metachars and dont_blame_nrpe option inside the NRPE configuration file - /etc/nagios/nrpe.cfg”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • herolab.usd.de https://herolab.usd.de/security-advisories/usd-2020-0002/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 3.7 AV:L/AC:H/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.