CVE-2025-34284 [Critical] | Command Injection in Nagios Xi

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-26	0.46%	0.71%	+0.24%
2	2026-04-09	0.29%	0.46%	+0.17%
3	2026-03-28	—	0.29%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-26

0.46%

0.71%

+0.24%

2026-04-09

0.29%

0.46%

+0.17%

2026-03-28

—

0.29%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.4	4.0	CRITICAL	`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:H) High privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:H) High confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:H) High integrity impact on the vulnerable system. Vulnerable system availability impact (VA:H) High availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:H) High confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:H) High integrity impact on subsequent systems. Subsequent system availability impact (SA:H) High availability impact on subsequent systems. Exploit maturity (threat) (E:X) Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked). Confidentiality requirement (CR:X) Not defined: insufficient information; scoring treats this like High (worst case). Integrity requirement (IR:X) Not defined: insufficient information; scoring treats this like High (worst case). Availability requirement (AR:X) Not defined: insufficient information; scoring treats this like High (worst case). Modified attack vector (MAV:X) Not defined: scoring uses the Base Attack Vector (AV). Modified attack complexity (MAC:X) Not defined: scoring uses the Base Attack Complexity (AC). Modified attack requirements (MAT:X) Not defined: scoring uses the Base Attack Requirements (AT). Modified privileges required (MPR:X) Not defined: scoring uses the Base Privileges Required (PR). Modified user interaction (MUI:X) Not defined: scoring uses the Base User Interaction (UI). Modified vulnerable system confidentiality impact (MVC:X) Not defined: scoring uses the Base VC metric. Modified vulnerable system integrity impact (MVI:X) Not defined: scoring uses the Base VI metric. Modified vulnerable system availability impact (MVA:X) Not defined: scoring uses the Base VA metric. Modified subsequent system confidentiality impact (MSC:X) Not defined: scoring uses the Base SC metric. Modified subsequent system integrity impact (MSI:X) Not defined: scoring uses the Base SI metric. Modified subsequent system availability impact (MSA:X) Not defined: scoring uses the Base SA metric. Safety (supplemental) (S:X) Not evaluated. Automatable (supplemental) (AU:X) Not evaluated. Recovery (supplemental) (R:X) Not evaluated. Value density (supplemental) (V:X) Not evaluated. Vulnerability response effort (supplemental) (RE:X) Not evaluated. Provider urgency (supplemental) (U:X) Not evaluated.	—	—	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.4

4.0

CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L): Exploitation conditions are straightforward and stable.
Attack requirements (AT:N): No additional preconditions are required beyond normal reachability.
Privileges required (PR:H): High privileges are required.
User interaction (UI:N): No user interaction is required.
Vulnerable system confidentiality impact (VC:H): High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H): High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H): High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:H): High confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:H): High integrity impact on subsequent systems.
Subsequent system availability impact (SA:H): High availability impact on subsequent systems.
Exploit maturity (threat) (E:X): Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X): Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X): Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X): Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X): Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X): Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X): Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X): Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X): Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X): Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X): Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X): Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X): Not evaluated.
Automatable (supplemental) (AU:X): Not evaluated.
Recovery (supplemental) (R:X): Not evaluated.
Value density (supplemental) (V:X): Not evaluated.
Vulnerability response effort (supplemental) (RE:X): Not evaluated.
Provider urgency (supplemental) (U:X): Not evaluated.

—

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

Affected software / configurations for CVE-2025-34284

Vendor	Product	Version	Raw CPE
nagios	nagios_xi	< 2024	cpe:2.3:a:nagios:nagios_xi::::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.0.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.0.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1.3::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1.4::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.1.5::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.2.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.2.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.3::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.3.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.3.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.3.3::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.3.4::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.4::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.4.1::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.4.2::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.4.3::::::
nagios	nagios_xi	2024	cpe:2.3:a:nagios:nagios_xi:2024:r1.4.4::::::

References for CVE-2025-34284

URL	Tags
https://www.nagios.com/changelog/nagios-xi/	Release Notes
https://www.nagios.com/products/security/#nagios-xi	Vendor Advisory
https://www.vulncheck.com/advisories/nagios-xi-authenticated-command-injection-via-winrm-plugin	Third Party Advisory

URL

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

Exploit prediction scoring system (EPSS) score for CVE-2025-34284

Common vulnerability scoring system (CVSS) metrics for CVE-2025-34284

Weakness enumeration for CVE-2025-34284

Affected software / configurations for CVE-2025-34284

References for CVE-2025-34284