What is the CVSS score of CVE-2021-25298?

CVE-2021-25298 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 75.2%.

Is there a public PoC exploit available for CVE-2021-25298?

Yes, a public proof-of-concept exploit is available for CVE-2021-25298. Prioritise patching immediately. EPSS: 75.2%.

Nagios Xi CVE-2021-25298

HIGH

OS Command Injection (CWE-78)

2021-02-15 cve@mitre.org

PHP Command Injection Nagios Xi Nagios

8.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. CISA has confirmed active exploitation in the wild. Public proof-of-concept exploit code is available. EPSS exploitation probability: 75.20%.
Exploit ScenarioDerived	A remote attacker could execute arbitrary operating system commands on the host by sending crafted requests to the affected application.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.

Exploited in the wild (CISA KEV) No patch listed yet 75.2% exploitation probability (EPSS)

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AnalysisAI

Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. 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/cloud-vm/cloud-vm.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. Affected products include: Nagios Nagios Xi.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 05, 2026 - 01:31 CISA

CVE Published

Feb 15, 2021 - 13:15 nvd

HIGH 8.8

DescriptionNVD

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/cloud-vm/cloud-vm.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.

Threat Intelligence Overview

Threat Score

7.0/10

Composite threat intelligence

EPSS Score

75.2%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

NVD

CVE.org

CISA KEV

EPSS POC (2)

GitHub

VulDB Metasploit

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC Yes

EPSS 75.2%

Patch available No

Active threat Yes

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

High

Priority Score

204

Low Medium High Critical

KEV: +50

EPSS: +75

CVSS: +44

PoC: +20

Weaponized: +15

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Affected Products (CPE)NVD

cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*

More in Nagios Xi

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CVE-2021-25296 HIGH Act Now POC

8.8 Feb 15

Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re

CVE-2021-25297 HIGH Act Now POC

8.8 Feb 15

Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re

CVE-2021-25299 MEDIUM This Month POC

6.1 Feb 15

Nagios XI version xi-5.7.5 is affected by cross-site scripting (XSS). Rated medium severity (CVSS 6.1), this vulnerabili

CVE-2018-15708 CRITICAL Emergency POC

9.8 Nov 14

Snoopy 1.0 in Nagios XI 5.5.6 allows remote unauthenticated attackers to execute arbitrary commands via a crafted HTTP r

CVE-2018-8734 CRITICAL Emergency POC

9.8 Apr 18

SQL injection vulnerability in the core config manager in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker

CVE-2018-8733 CRITICAL Emergency POC

9.8 Apr 18

Authentication bypass vulnerability in the core config manager in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an

CVE-2021-37343 HIGH Act Now POC

8.8 Aug 13

A path traversal vulnerability exists in Nagios XI below version 5.8.5 AutoDiscovery component and could lead to post au

CVE-2019-15949 HIGH Act Now POC

8.8 Sep 05

Nagios XI before 5.6.6 allows remote command execution as root. Rated high severity (CVSS 8.8), this vulnerability is re

CVE-2018-8736 HIGH Act Now POC

8.8 Apr 18

A privilege escalation vulnerability in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker to leverage an RC

CVE-2018-8735 HIGH Act Now POC

8.8 Apr 18

Remote command execution (RCE) vulnerability in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker to execut

CVE-2013-6875 HIGH Act Now POC

7.5 Nov 26

SQL injection vulnerability in functions/prepend_adm.php in Nagios Core Config Manager in Nagios XI before 2012R2.4 allo

CVE-2018-15710 HIGH Act Now POC

7.8 Nov 14

Nagios XI 5.5.6 allows local authenticated attackers to escalate privileges to root via Autodiscover_new.php. Rated high

Same weakness CWE-78 – OS Command Injection

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CVE-2018-11138 CRITICAL POC

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CVE-2014-6278 HIGH POC

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CVE-2020-9054 CRITICAL POC

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CVE-2017-6334 HIGH POC

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CVE-2024-50603 CRITICAL POC

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CVE-2024-21887 CRITICAL POC

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CVE-2016-3081 HIGH POC

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CVE-2012-1823 CRITICAL POC

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CVE-2016-1555 CRITICAL POC

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CVE-2024-55956 CRITICAL POC

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References

Advisories & patches

ADVISORY https://vuldb.com/vuln/169955 REF http://nagios.com REF https://assets.nagios.com/downloads/nagiosxi/versions.php REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-25298

Search Externally

GitHub PoC

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