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Fencer Vulns
high 8.8

CVE-2021-25296 kev in the critical feed json

Nagios XI version xi-5.7.5 is affected by OS command injection.

published 2021-02-15 5 y ago modified 2026-07-09 4 mo ago also EUVD-2021-12196

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2022-01-18
epss
71.9%
EPSS 71.9% chance of exploitation in 30 days, percentile 99.4%
public exploits
1
Metasploit, plus a Nuclei check

Summary

Nagios XI version xi-5.7.5 is affected by OS command injection. The vulnerability exists in the file /usr/local/nagiosxi/html/includes/configwizards/windowswmi/windowswmi.inc.php due to improper sanitization of authenticated user-controlled input by a single HTTP request, which can lead to OS command injection on the Nagios XI server.

Patch / fix

cisa required action Apply updates per vendor instructions.

Timeline

  1. First public exploit (Metasploit exploit/linux/http/nagios_xi_configwizards_authenticated_rce)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-02-01 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Nagios, Nagios XI
CISA name
Nagios XI OS Command Injection

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

71.94% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/linux/http/nagios_xi_configwizards_authenticated_rce Nagios XI 5.5.6 to 5.7.5 - ConfigWizards Authenticated Remote Code Exection metasploit exploit, excellent rank, 2021-02-13
  • Nuclei template Nagios XI 5.5.6-5.7.5 - Authenticated Remote Command Injection nuclei detection template
  • github.com https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/161561/Nagios-XI-5.7.5-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
  • fastly.com https://www.fastly.com/blog/anatomy-of-a-command-injection-cve-2021-25296-7-8-with-metasploit-module-and referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

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.