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CVE-2025-12420: Servicenow Now Assist Ai Agents Security Vulnerability (CVSS 9.3)

CVE-2025-12420 is a critical severity security vulnerability in Servicenow Now Assist Ai Agents with a CVSS score of 9.3. Its EPSS score of 53.2 percent signals a high chance of exploitation, so patch it in your next emergency window.

Last updated: Jun 17, 2026

Quick answer

Direct answer

CVE-2025-12420 is a critical severity security vulnerability in Servicenow Now Assist Ai Agents with a CVSS score of 9.3. Its EPSS score of 53.2 percent signals a high chance of exploitation, so patch it in your next emergency window.

Risk scores

CVSS base score
9.3CRITICAL
EPSS probability
53.19%
Higher than 99 percent of all CVEs
CISA KEV
Not listed
CVSS metricWhat it means
Attack vector (AV:N)Network: reachable remotely
Attack complexity (AC:L)Low complexity
Attack requirements (AT:N)No attack requirements
Privileges required (PR:N)No privileges required
User interaction (UI:N)No user interaction
Confidentiality (VC:H)High confidentiality impact
Integrity (VI:H)High integrity impact
Availability (VA:H)High availability impact

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/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:N/AU:Y/R:U/V:C/RE:H/U:Amber

About Servicenow Now Assist Ai Agents

CVE-2025-12420 affects Servicenow Now Assist Ai Agents, a product from Servicenow. Before acting, confirm where Servicenow Now Assist Ai Agents runs in your estate, who owns it and whether it is reachable from the internet, because exposure decides real risk more than the score alone.

What the flaw is

In plain terms: 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.

Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Its EPSS score of 53.2 percent signals a high chance of exploitation, so patch it in your next emergency window.

Affected versions and timeline

FieldDetail
ProductServicenow Now Assist Ai Agents
Affected versionsNow Assist Ai Agents before 5.1.18; Now Assist Ai Agents from 5.2.0 before 5.2.19; Virtual Agent Api before 3.15.2; Virtual Agent Api from 4.0.0 before 4.0.4
PublishedJan 12, 2026
Last modifiedJun 17, 2026
Added to CISA KEVNot listed
Assigning CNApsirt@servicenow.com

How to detect it

  • Inventory every instance of Servicenow Now Assist Ai Agents and record the running version against the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Review logs on affected systems for unusual requests, errors or new processes around the vulnerable function.
  • Confirm with an authenticated vulnerability scan once your scanner has a check for this CVE.

How to fix it

  • Apply the fixed version of Servicenow Now Assist Ai Agents named in the vendor advisory.
  • If patching must wait, restrict network access to the affected service and put it behind authentication or a web application firewall rule.
  • Rescan after the change to prove the exposure is gone, then close the ticket.

CTEM action plan

CTEM stageWhat to do for this CVE
ScopeAdd every business service that depends on Servicenow Now Assist Ai Agents to the current CTEM cycle.
DiscoverFind all instances, including shadow and cloud deployments, and record versions and exposure.
PrioritizeRank using EPSS and CVSS together with asset exposure and business impact.
ValidateConfirm the flaw is reachable and exploitable in your environment and that compensating controls work.
MobilizeAssign the fix to the asset owner with a due date matched to the priority, then verify closure.

CWE References

Technical References

Frequently asked questions

CVE-2025-12420 is a critical severity security vulnerability in Servicenow Now Assist Ai Agents with a CVSS score of 9.3. Its EPSS score of 53.2 percent signals a high chance of exploitation, so patch it in your next emergency window.

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