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Public proof of conceptFix available

CVE-2025-20124

A public proof of concept exists; no exploitation attested.

  • Published2025-02-05
  • Fixed in3.1
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in an API of Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands as the root user on an affected device. This vulnerability is due to insecure deserialization of user-supplied Java byte streams by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object to an affected API. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges. Note: To successfully exploit this vulnerability, the attacker must have valid read-only administrative credentials. In a single-node deployment, new devices will not be able to authenticate during the reload time.

Timeline

dates in UTC
  1. 2025-08-11Exploit-DB entryExploit-DB

Versions per branch

NVD
Cisco identity services engine
BranchAffectedFixed in
3.1< 3.13.1
3.1= 3.1.0no fix published
3.2= 3.2.0no fix published
3.3= 3.3.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As cisco, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Cisco Identity Services Engine Softwareother versions: unknown
    Affected
    • = 3.0.0no fix stated
    • = 3.0.0 p1no fix stated
    • = 3.0.0 p2no fix stated
    • = 3.0.0 p3no fix stated
    • = 3.1.0no fix stated
    • = 3.0.0 p4no fix stated
    • = 3.1.0 p1no fix stated
    • = 3.0.0 p5no fix stated

    23 more version lines in the CVE record.

  • Cisco ISE Passive Identity Connectorother versions: unknown
    Affected
    • = 3.0.0no fix stated
    • = 3.2.0no fix stated
    • = 3.1.0no fix stated
    • = 3.3.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-02-05

Fix

  1. Update Cisco identity services engine to 3.1

Advisories and patches

Detection

read 2026-11-10 09:41 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52396
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
2025-02-05
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-4ch8-9r52-j78v

Frequently asked questions

What is CVE-2025-20124?

A vulnerability in an API of Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands as the root user on an affected device. This vulnerability is due to insecure deserialization of user-supplied Java byte streams by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object to an affected API. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges. Note:&nbsp;To successfully exploit this vulnerability, the attacker must have valid read-only administrative credentials. In a single-node deployment, new devices will not be able to authenticate during the reload time.

Is CVE-2025-20124 actively exploited?

Active exploitation of CVE-2025-20124 has not been confirmed. Its EPSS score was 18.6% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-20124?

CVE-2025-20124 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record