Vulnerability Name:

CVE-2022-20756 (CCN-220812)

Assigned:2021-11-02
Published:2022-03-02
Updated:2022-04-14
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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2022-20756

Source: XF
Type: UNKNOWN
cisco-ise-cve202220756-dos(220812)

Source: CCN
Type: Cisco Security Advisory cisco-sa-ise-dos-JLh9TxBp
Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

Source: CISCO
Type: Vendor Advisory
20220302 Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:identity_services_engine:2.2.0:patch17:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.4.0:patch12:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.4.0:patch13:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.4.0:patch14:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch10:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch5:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch6:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch7:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch8:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.6.0:patch9:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.7.0:patch2:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.7.0:patch3:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.7.0:patch4:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:2.7.0.356:patch1:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:3.0.0:-:*:*:*:*:*:*
  • OR cpe:/a:cisco:identity_services_engine:3.1:-:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:cisco:identity_services_engine:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco identity services engine 2.2.0 patch17
    cisco identity services engine 2.4.0 patch12
    cisco identity services engine 2.4.0 patch13
    cisco identity services engine 2.4.0 patch14
    cisco identity services engine 2.6.0 patch10
    cisco identity services engine 2.6.0 patch5
    cisco identity services engine 2.6.0 patch6
    cisco identity services engine 2.6.0 patch7
    cisco identity services engine 2.6.0 patch8
    cisco identity services engine 2.6.0 patch9
    cisco identity services engine 2.7.0 patch2
    cisco identity services engine 2.7.0 patch3
    cisco identity services engine 2.7.0 patch4
    cisco identity services engine 2.7.0.356 patch1
    cisco identity services engine 3.0.0 -
    cisco identity services engine 3.1 -
    cisco identity services engine -