CVE-2021-25298Known exploitationPublic exploitNetwork attack vector

Authenticated command execution via unsanitized Cloud-VM address

Published Feb 15, 2021 · Updated Jul 9, 2026

OS command injection in the Nagios XI Cloud-VM wizard in 5.5.6 through 5.7.5 allows remote authenticated users to execute commands. The wizard reads the ip_address request parameter and concatenates it without sanitization into a ping command passed to PHP exec(). A valid low-privileged Nagios XI session and CSRF token reach the vulnerable wizard; injected commands run as the Apache service account, allowing host data access, modification, and service interruption.

CVSS severity8.8
High
EPSS probability75.15%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in the Nagios XI Cloud-VM wizard in 5.5.6 through 5.7.5 allows remote authenticated users to execute commands. The wizard reads the ip_address request parameter and concatenates it without sanitization into a ping command passed to PHP exec(). A valid low-privileged Nagios XI session and CSRF token reach the vulnerable wizard; injected commands run as the Apache service account, allowing host data access, modification, and service interruption.

The record

CVE
CVE-2021-25298
Published
Feb 15, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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