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Fencer Vulns
medium 4.9

CVE-2020-13977 json

Nagios 4.4.5 allows an attacker, who already has administrative access to change the "URL for JSON CGIs" configuration setting, to modify t…

published 2020-06-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6148

cvss
4.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

Nagios 4.4.5 allows an attacker, who already has administrative access to change the "URL for JSON CGIs" configuration setting, to modify the Alert Histogram and Trends code via crafted versions of the archivejson.cgi, objectjson.cgi, and statusjson.cgi files. NOTE: this vulnerability has been mistakenly associated with CVE-2020-1408.

Patch / fix

  • nagios4 Debian 14, Debian 13, Debian 12 4.3.4-4

debian advisories DEBIAN-CVE-2020-13977

  • nagios openSUSE Tumbleweed 4.4.6-2.5
  • nagios Package Hub 15 SP2 4.4.6-bp152.2.3.1
  • nagios openSUSE Leap 15.2 4.4.6-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:11073-1openSUSE-SU-2021:0735-1openSUSE-SU-2021:0715-1

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-2020-13977 updated cvss 4.9

nagios: URL injection (post-authentication) vulnerability

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

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

2.73% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • anhtai.me https://anhtai.me/nagios-core-4-4-5-url-injection/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:P/A:N

Classification

Weakness
  • CWE-829 Inclusion of Functionality from Untrusted Control Sphere

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.