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TI-2020-18991 Aliases CVE-2020-36856GHSA-9f8q-34c7-3prr

Nagios XI < 5.6.14 Authenticated RCE command_test.php via address

Priority MEDIUM 53CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

Nagios XI versions prior to 5.6.14 contain an authenticated remote command execution vulnerability in the CCM command_test.php script. Insufficient validation of the `address` parameter allows an authenticated user with access to the Core Config Manager to inject shell metacharacters that are incorporated into backend command invocations. Successful exploitation enables arbitrary command execution with the privileges of the Nagios XI web application user and may be leveraged to execute commands on the underlying XI host, modify system configuration, or fully compromise the host.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02453 84th percentileScored 2026-11-07
Fix Fixed XI (Nagios): 5.6.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NagiosXIbefore 5.6.145.6.14Patch availableCNA
  • XI VendorNagios Affected before 5.6.14 Fixed in 5.6.14 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*before 5.6.14VulnerableNagios
  • cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:* Versions before 5.6.14 Vulnerable ·Nagios

Remediation

  • Fix · CNA XI (Nagios) Fixed in 5.6.14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Nagios XI 5.6.14

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2020-18992 Nagios XI < 5.6.14 Authenticated SQL Injection via SNMP Trap Interface PagePriority MEDIUM 44
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-36856
  2. 2026-10-03 Alias added: GHSA-9f8q-34c7-3prr

References

Patch 2

  • TI-2021-07545 Nagios XI version xi-5.7.5 is affected by OS command injection. KEVCVSS 3.1HIGH 8.8
  • TI-2021-07544 Nagios XI version xi-5.7.5 is affected by OS command injection. KEVCVSS 3.1HIGH 8.8
  • TI-2021-07543 Nagios XI version xi-5.7.5 is affected by OS command injection. KEVCVSS 3.1HIGH 8.8
  • TI-2019-11993 Nagios XI before 5.6.6 allows remote command execution as root. KEVCVSS 3.1HIGH 8.8
  • TI-2023-26027 Nagios XI before version 5.11.3 was discovered to contain a remote code execution (RCE)… CVSS 3.1CRITICAL 9.8
  • TI-2018-11196 Snoopy 1.0 in Nagios XI 5.5.6 allows remote unauthenticated attackers to execute… CVSS 3.0CRITICAL 9.8
See all 191 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences