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CVE-2026-20282

Cisco Identity Services Engine Authenticated Write Vulnerability

Published: Sep 16, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-641
4.9MEDIUM
NVD MITRE
EPSS Score
0.6%
Top 54.8%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available
Self-Check
Not available

Description

A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.

In plain language

AI Act now

This affects cisco identity services engine software and lets a logged-in administrator change the device’s underlying system; treat it as urgent because a public exploit is available.

Executive summary

Authenticated remote OS write vulnerability in cisco identity services engine software caused by insufficient validation of crafted HTTP-request input; administrative credentials are required.

If affected, business impact
Device system takeoverSecurity policy tamperingNetwork access disruptionSensitive configuration exposure

What to do now

  1. Check whether you run cisco identity services engine software and identify every account with administrative access.
  2. There is no confirmed fixed version or patch information available; ask Cisco or your support provider for the remediation release and apply it as soon as provided.
  3. Restrict administrative access to trusted staff and management networks, rotate administrator passwords, and remove unused administrator accounts.
  4. Review administrator activity and system changes for unexpected write operations or configuration changes.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-641

Affected Products

Cisco
commercial·USaka cisco systems inc., cisco systems
Cisco Identity Services Engine Software
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Is your org exposed to CVE-2026-20282?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-mult-vul-ymSsTLCc
sec.cloudapps.cisco.com
News mentions
2

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