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TI-2022-05315 Aliases CVE-2022-20756GHSA-qwcc-f7fm-5q6x

Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

Priority MEDIUM 46CWE-399Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.

Summary

A vulnerability in the RADIUS feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause the affected system to stop processing RADIUS packets. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by attempting to authenticate to a network or a service where the access server is using Cisco ISE as the RADIUS server. A successful exploit could allow the attacker to cause Cisco ISE to stop processing RADIUS requests, causing authentication/authorization timeouts, which would then result in legitimate requests being denied access. Note: To recover the ability to process RADIUS packets, a manual restart of the affected Policy Service Node (PSN) is required. See the Details section for more information.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01455 73rd 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
Yes
Technical impact
Partial

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 · 16

CPEVersionsRoleVendor
cpe:2.3:a:cisco:identity_services_engine:2.2.0:patch17:*:*:*:*:*:*2.2.0 patch17VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch12:*:*:*:*:*:*2.4.0 patch12VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch13:*:*:*:*:*:*2.4.0 patch13VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch14:*:*:*:*:*:*2.4.0 patch14VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch10:*:*:*:*:*:*2.6.0 patch10VulnerableCisco
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: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:2.2.0:patch17:*:*:*:*:*:* Versions 2.2.0 patch17 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch12:*:*:*:*:*:* Versions 2.4.0 patch12 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch13:*:*:*:*:*:* Versions 2.4.0 patch13 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.4.0:patch14:*:*:*:*:*:* Versions 2.4.0 patch14 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:identity_services_engine:2.6.0:patch10:*:*:*:*:*:* Versions 2.6.0 patch10 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
  • 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
Show 6 more CPE
CPEVersionsRoleVendor
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:2.7.0.356:patch1:*:*:*:*:*:*2.7.0.356 patch1VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:*3.0.0VulnerableCisco
cpe:2.3:a:cisco:identity_services_engine:3.1:-:*:*:*:*:*:*3.1VulnerableCisco
  • 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:2.7.0.356:patch1:*:*:*:*:*:* Versions 2.7.0.356 patch1 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:3.1:-:*:*:*:*:*:* Versions 3.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-20756
  2. 2026-10-03 Alias added: GHSA-qwcc-f7fm-5q6x

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