CVE-2025-12420: A vulnerability has been identified in the ServiceNow AI Platform that could enable an unauthenticated user to

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CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2025-12420 is a critical-severity flaw (CVSS 9.8) affecting now assist ai agents, virtual agent api. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	53.2% (top 1%)
CISA exploited list	No
Weakness	CWE-250
Published	2026-01-12
Last modified	2026-06-17

Publisher (CNA): ServiceNow · Vendor: servicenow

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-12 22:16 UTCPublished CVE record published
2026-06-17 08:32 UTCUpdated Record last modified

servicenow now assist ai agents UPGRADE

Affected: < 5.1.18 · >= 5.2.0 and < 5.2.19

Fixed in: 5.1.18, 5.2.19

Safe to downgrade to: a release before 5.2.0

1. Check installed version

apt-cache policy now-assist-ai-agents || rpm -q now-assist-ai-agents || now-assist-ai-agents --version

2. UPGRADE to 5.1.18 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade now-assist-ai-agents

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade now-assist-ai-agents

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison now-assist-ai-agents sudo apt install now-assist-ai-agents=<VERSION_BEFORE_5.2.0> sudo apt-mark hold now-assist-ai-agents

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list now-assist-ai-agents sudo dnf downgrade now-assist-ai-agents-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add now-assist-ai-agents

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

servicenow virtual agent api UPGRADE

Affected: < 3.15.2 · >= 4.0.0 and < 4.0.4

Fixed in: 3.15.2, 4.0.4

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy virtual-agent-api || rpm -q virtual-agent-api || virtual-agent-api --version

2. UPGRADE to 3.15.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade virtual-agent-api

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade virtual-agent-api

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison virtual-agent-api sudo apt install virtual-agent-api=<VERSION_BEFORE_4.0.0> sudo apt-mark hold virtual-agent-api

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list virtual-agent-api sudo dnf downgrade virtual-agent-api-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add virtual-agent-api

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: cyberdudebivash/CYBERDUDEBIVASH-ServiceNow-AI-Agent-Audit-Script (0 stars)
GitHub PoC: OloladeAbiola03/aisecplus-week01-servicenow-ai-security-incident (0 stars)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-12420?

now assist ai agents: upgrade to 5.1.18, 5.2.19; virtual agent api: upgrade to 3.15.2, 4.0.4. Exact commands for each OS are on this page.

Is CVE-2025-12420 being exploited?

CVE-2025-12420 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-12420 affect?

CVE-2025-12420 affects now assist ai agents, virtual agent api. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2025-12420?

Priority 67/100. Critical severity; EPSS top 1%: very likely to be exploited; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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