High Injection

CVE-2025-34284 — Nagios XI < 2024R2 Authenticated Command Injection via WinRM Plugin

Nagios XI versions prior to 2024R2 contain a command injection vulnerability in the WinRM plugin. Insufficient validation of user-supplied parameters allows an authenticated administrator 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 can be leveraged to modify configuration, exfiltrate data, disrupt monitoring operations, or execute commands on the underlying host operating system.

Published Oct 30, 2025 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulnCheck

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 4% (30-day exploitation probability)+14
Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

4.03%

ahead of 90% of scored CVEs · Oct 15, 2026

Affects

Nagios

Nagios Xi

CVSS base

8.8

High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Nagios Nagios Xi).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
EPSS ahead of 90% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Nagios	Nagios Xi	version 2024-r1.2.2version 2024-r1.4.4version 2024-r1.4.3version 2024-r1.4.2version 2024-r1.4.1version 2024-r1.4version 2024-r1.3.4version 2024-r1.3.3 and 15 more version 2024-r1.3.2version 2024-r1.3.1version 2024-r1.3< 2024version 2024-r1.2.1version 2024-r1.2version 2024-r1.1.5version 2024-r1.1.4version 2024-r1.1.3version 2024-r1.1.2version 2024-r1.1.1version 2024-r1.1version 2024-r1.0.2version 2024-r1.0.1version 2024-r1	Vulnerable	NIST National Vulnerability Database
Nagios	Nagios Xi	< 2024R2	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.4	CVSS 4.0	Critical	—	—	disclosure@vulncheck.com via NIST National Vulnerability Database
9.4	CVSS 4.0	Critical	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP
8.8	CVSS 3.1	High	2.8	5.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-78 · OS Command Injection

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 4.03%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Look for parameters with command/query metacharacters and unexpected child processes of the service.

web/proxy/WAF logsnetwork IDS/IPSapplication logsendpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · nagios/xi
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 8.8
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Oct 30, 2025 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

3 on the record

www.nagios.com/changelog/nagios-xi/
Release Notes, release-notes, patch, NIST National Vulnerability Database
www.nagios.com/products/security/
Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database
www.vulncheck.com/advisories/nagios-xi-authenticated-command-injection-via-winrm-plugin
Third Party Advisory, third-party-advisory, NIST National Vulnerability Database

Elsewhere on this site

Nagios
every CVE for this vendor

Injection
same class

CWE-78
other pages naming this weakness

Related CVEs (same products)

Low CVE-2023-24035 An issue was discovered in Nagios XI before 5.9.3. The is_insecure_login_authenticated… Sep 14, 2026
Low CVE-2023-24034 Open Redirect in Nagios Nagios Xi Sep 14, 2026
High CVE-2026-2041 Nagios Host zabbixagent_configwizard_func Command Injection Remote Code Execution Vulnerability Feb 20, 2026
High CVE-2026-2042 Nagios Host monitoringwizard Command Injection Remote Code Execution Vulnerability Feb 20, 2026
High CVE-2026-2043 Nagios Host esensors_websensor_configwizard_func Command Injection Remote Code Execution Vulnerability Feb 20, 2026
High CVE-2025-67255 SQL Injection in Nagios Nagios Xi Dec 29, 2025

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-34284 is "Nagios XI < 2024R2 Authenticated Command Injection via WinRM Plugin", rated High. It affects Nagios Xi (Nagios); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. EPSS 4.03% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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