VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 28 July 2025Ransomware use: unknown
Cisco Identity Services Engine

CVE-2025-20337: Cisco Identity Services Engine Injection Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 28 Jul 2025, 12 days after the CVE record was published.

How likely is exploitation in the next 30 days?
74.5%

EPSS score, percentile 99.5 of all scored records

How severe?
10.0 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA deadline 18 Aug 2025. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • 3.3.0
  • 3.3 Patch 2
  • 3.3 Patch 1
  • 3.3 Patch 3
  • 3.4.0
  • 3.3 Patch 4

and 7 more in the table below

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA due date for this action: 18 August 2025.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Cisco Cisco Identity Services Engine Software
StatusVersions
Affected3.3.0
Affected3.3 Patch 2
Affected3.3 Patch 1
Affected3.3 Patch 3
Affected3.4.0
Affected3.3 Patch 4
Affected3.4 Patch 1
Affected3.3 Patch 5
Affected3.3 Patch 6

Versions not listed are: unknown.

Cisco Cisco ISE Passive Identity Connector
StatusVersions
Affected3.2.0
Affected3.1.0
Affected3.3.0
Affected3.4.0

Versions not listed are: unknown.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Cisco Identity Services Engine contains an injection vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC due to insufficient validation of user-supplied input allowing an attacker to exploit this vulnerability by submitting a crafted API request. Successful exploitation could allow an attacker to perform remote code execution and obtaining root privileges on an affected device.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2025-20337 to its Known Exploited Vulnerabilities (KEV) catalog on 28 Jul 2025.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 18 Aug 2025.
  • The CVE record was published on 16 Jul 2025, 12 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 10.0 (Critical), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 74.5% (percentile 99.5), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Cisco ISE API Unauthenticated Remote Code Execution Vulnerability

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
16 Jul 2025CVE record published
28 Jul 2025Added to CISA KEV
18 Aug 2025CISA due date for the required action
26 Feb 2026CVE record last updated

References

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