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TI-2021-01318 Aliases CVE-2021-1594GHSA-8rx9-j5hq-fx8v

Cisco Identity Services Engine Privilege Escalation Vulnerability

Priority MEDIUM 40CWE-266Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Privilege escalation, Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-266 and CWE-78.

Summary

A vulnerability in the REST API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to perform a command injection attack and elevate privileges to root. This vulnerability is due to insufficient input validation for specific API endpoints. An attacker in a man-in-the-middle position could exploit this vulnerability by intercepting and modifying specific internode communications from one ISE persona to another ISE persona. A successful exploit could allow the attacker to run arbitrary commands with root privileges on the underlying operating system. To exploit this vulnerability, the attacker would need to decrypt HTTPS traffic between two ISE personas that are located on separate nodes.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01398 72nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Identity Services Engine Softwareall versions—No fix listedCNA
  • Cisco Identity Services Engine Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 24

CPEVersionsRoleVendor
cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*2.4.0 to before 2.6.0VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.4\(0.902\):*:*:*:*:*:*:*2.4(0.902)VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):*:*:*:*:*:*:*2.6(0.156)VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:-:*:*:*:*:*:*2.6.0VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch1:*:*:*:*:*:*2.6.0 patch1VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch2:*:*:*:*:*:*2.6.0 patch2VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch3:*:*:*:*:*:*2.6.0 patch3VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch5:*:*:*:*:*:*2.6.0 patch5VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch6:*:*:*:*:*:*2.6.0 patch6VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch7:*:*:*:*:*:*2.6.0 patch7VulnerableCisco
  • cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:* Versions 2.4.0 to before 2.6.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.4\(0.902\):*:*:*:*:*:*:* Versions 2.4(0.902) Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):*:*:*:*:*:*:* Versions 2.6(0.156) Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:-:*:*:*:*:*:* Versions 2.6.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch1:*:*:*:*:*:* Versions 2.6.0 patch1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch2:*:*:*:*:*:* Versions 2.6.0 patch2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch3:*:*:*:*:*:* Versions 2.6.0 patch3 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch5:*:*:*:*:*:* Versions 2.6.0 patch5 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch6:*:*:*:*:*:* Versions 2.6.0 patch6 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch7:*:*:*:*:*:* Versions 2.6.0 patch7 Vulnerable ·Cisco
Show 14 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch8:*:*:*:*:*:*2.6.0 patch8VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch9:*:*:*:*:*:*2.6.0 patch9VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7\(0.903\):*:*:*:*:*:*:*2.7(0.903)VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7.0:-:*:*:*:*:*:*2.7.0VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch1:*:*:*:*:*:*2.7.0 patch1VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:*2.7.0 patch2VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:*2.7.0 patch3VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:*2.7.0 patch4VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0\(0.458\):*:*:*:*:*:*:*3.0(0.458)VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:*3.0.0VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1:*:*:*:*:*:*3.0.0 patch1VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch2:*:*:*:*:*:*3.0.0 patch2VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch3:*:*:*:*:*:*3.0.0 patch3VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.1\(0.440\):*:*:*:*:*:*:*3.1(0.440)VulnerableCisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch8:*:*:*:*:*:* Versions 2.6.0 patch8 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch9:*:*:*:*:*:* Versions 2.6.0 patch9 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7\(0.903\):*:*:*:*:*:*:* Versions 2.7(0.903) Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7.0:-:*:*:*:*:*:* Versions 2.7.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch1:*:*:*:*:*:* Versions 2.7.0 patch1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:* Versions 2.7.0 patch2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:* Versions 2.7.0 patch3 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:* Versions 2.7.0 patch4 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.0\(0.458\):*:*:*:*:*:*:* Versions 3.0(0.458) Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1:*:*:*:*:*:* Versions 3.0.0 patch1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch2:*:*:*:*:*:* Versions 3.0.0 patch2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch3:*:*:*:*:*:* Versions 3.0.0 patch3 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:3.1\(0.440\):*:*:*:*:*:*:* Versions 3.1(0.440) Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-1594
  2. 2026-10-03 Alias added: GHSA-8rx9-j5hq-fx8v

References

Advisory 1

  • TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-14632 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-14578 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-14579 Cisco ISE API Unauthenticated Remote Code Execution Vulnerability CVSS 3.1CRITICAL 10.0
  • TI-2022-05522 OS command injection in Cisco Identity Services Engine Software CVSS 3.1HIGH 8.8
See all 197 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences