NVD / CVE Program· CNA cisco

CVE-2025-20337: Cisco ISE API Unauthenticated Remote Code Execution Vulnerability

Noroxi assessment

Priority: Now (action score 92/100)

CISA has confirmed exploitation in the wild (Jul 28, 2025). Remediation deadline for US federal agencies: Aug 18, 2025.
Probability of exploitation in the next 30 days: 74.4% (FIRST EPSS); higher than 99.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying operating system as root. The attacker does not require any valid credentials to exploit this vulnerability. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to obtain root privileges on an affected device.

CriticalCVSS 10.0 · v3.1KEVWeaponized No fix recorded

pre-auth RCE

BDU:2025-08631

Published: Jul 16, 2025
Updated: Jun 17, 2026
EPSS: 74.4% · 99th percentile
CWE: CWE-74

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 40 / 40 · 10.0 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 22 / 30 · 74.4%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · cisco: 10.0; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Jul 28, 2025. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Aug 18, 2025.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
cisco	identity services engine	cpe:2.3:a:cisco:identity_services_engine
cisco	identity services engine passive identity connector	cpe:2.3:a:cisco:identity_services_engine_passive_identity_connector

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

cisco identity services engine3.3.0
cisco identity services engine3.4.0
cisco identity services engine passive identity connector3.3.0
cisco identity services engine passive identity connector3.4.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

Cisco Cisco Identity Services Engine Software
- 3.3.0, 3.3 Patch 2, 3.3 Patch 1, 3.3 Patch 3, 3.4.0, 3.3 Patch 4, 3.4 Patch 1, 3.3 Patch 5, 3.3 Patch 6affected
Cisco Cisco ISE Passive Identity Connector
- 3.2.0, 3.1.0, 3.3.0, 3.4.0affected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2025-20281Cisco ISE API Unauthenticated Remote Code Execution VulnerabilityKEV
99Now
CVE-2026-76460Cisco Identity Services Engine Authentication Bypass VulnerabilityKEV
93Now
CVE-2025-20282Cisco ISE API Unauthenticated Remote Code Execution Vulnerability
52Plan

Published before and after this one in the same product

← EarlierCVE-2025-20284Jul 16, 2025 · Cisco Identity Services Engine Authenticated Remote Code Execution Vulnerability
36Monitor
← EarlierCVE-2025-20285Jul 16, 2025 · Cisco Identity Services Engine IP Filter Access Restriction for Admin Access Configuration Bypass Vulnerability
16Monitor
Later →CVE-2025-20131Aug 20, 2025 · Cisco Identity Services Engine Arbitrary File Upload Vulnerability
19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedJul 16, 2025
CISA KEVJul 28, 2025+11 d
TodayOct 29, 2026+470 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2025-2028121 days apartCisco ISE API Unauthenticated Remote Code Execution VulnerabilityKEV
99Now
CVE-2026-20130427 days apartCisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities
40Plan
CVE-2025-202840 days apartCisco Identity Services Engine Authenticated Remote Code Execution Vulnerability
36Monitor
CVE-2025-202830 days apartCisco Identity Services Engine Authenticated Remote Code Execution Vulnerability
32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).