Is CVE-2025-12420 in the CISA KEV catalog?

No. CVE-2025-12420 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-12420?

CVE-2025-12420 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-12420?

CVE-2025-12420 has an EPSS score of 45.49% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-12420?

Upgrade now assist ai agents to 5.2.19 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-12420

CRITICALEPSS 99th pctl

9.8

CVSS v3

NVD

Description

A vulnerability has been identified in the ServiceNow AI Platform that could enable an unauthenticated user to impersonate another user and perform the operations that the impersonated user is entitled to perform. ServiceNow has addressed this vulnerability by deploying a relevant security update to hosted instances in October 2025. Security updates have also been provided to ServiceNow self-hosted customers, partners, and hosted customers with unique configurations. Additionally, the vulnerability is addressed in the listed Store App versions. We recommend that customers promptly apply an appropriate security update or upgrade if they have not already done so.

CWE-250

How to fix

Remediation Available

now assist ai agentsNVD

Affected:>= 5.2.0, < 5.2.19Fixed in:5.2.19CVE-2025-12420derived from NVD

virtual agent apiNVD

Affected:>= 4.0.0, < 4.0.4Fixed in:4.0.4CVE-2025-12420derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

45.49%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1

support.servicenow.com

Related Vulnerabilities

Other CWE-250 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-1222	High	8.6	64%	-	Fix
CVE-2024-38813	High	7.5	17%	KEV	Fix
CVE-2025-34515	Critical	9.8	7.4%	-	-
CVE-2026-29205	High	8.6	7.2%	-	-
CVE-2019-16765	High	7.4	4.7%	-	Fix
CVE-2022-1808	High	8.8	3.4%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-27.