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High severity7.5NVD Advisory· Published Oct 6, 2021· Updated Jun 17, 2026

CVE-2021-1594

CVE-2021-1594

Description

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.

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Affected products

26
  • Cisco Systems, Inc./Identity Services Engine Expressllm-fuzzy
  • Cisco Systems, Inc./Identity Services Engine Softwarecpe-rescue25 versions
    n/a+ 24 more
    • (no CPE)range: n/a
    • cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*range: >=2.4.0,<2.6.0
    • cpe:2.3:a:cisco:identity_services_engine:2.4\(0.902\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:-:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch1:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch2:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch3:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch5:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch6:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch7:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch8:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch9:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7\(0.903\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7.0:-:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch1:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.0\(0.458\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch1:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch2:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.0.0:patch3:*:*:*:*:*:*
    • cpe:2.3:a:cisco:identity_services_engine:3.1\(0.440\):*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

News mentions

0

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