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PatchSiren cyber security CVE debrief

CVE-2020-8193 Citrix CVE debrief

CVE-2020-8193 is a Citrix authorization bypass vulnerability affecting Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP appliances. CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03, which makes it a high-priority issue for defenders even though the supplied corpus does not include a CVSS score or deeper technical detail. Systems that provide external access or authentication services should be reviewed first, and updates should be applied per vendor instructions as soon as possible.

Vendor
Citrix
Product
Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security teams and system owners responsible for Citrix ADC, Citrix Gateway, or Citrix SD-WAN WANOP appliances, especially if any instance is internet-facing or used for remote access.

Technical summary

The supplied source corpus identifies an authorization bypass vulnerability in Citrix ADC, Gateway, and SD-WAN WANOP appliances. An authorization bypass can allow actions to be performed without the intended access checks. The available sources do not provide additional technical mechanics, exploit conditions, or impact specifics, so defenders should rely on official vendor and CISA guidance for remediation details.

Defensive priority

High. CISA has placed this CVE in the Known Exploited Vulnerabilities catalog, so it should be treated as an urgent remediation item.

Recommended defensive actions

  • Apply vendor updates per official Citrix instructions.
  • Inventory all Citrix ADC, Gateway, and SD-WAN WANOP appliance instances.
  • Prioritize internet-facing and authentication-bearing systems for immediate review.
  • Validate whether compensating controls or temporary mitigations are needed until patching is complete, following vendor guidance.
  • Monitor authentication and access-control logs for unusual activity on affected appliances.
  • Confirm remediation status across production, test, and disaster recovery environments.

Evidence notes

The evidence corpus consists of CISA KEV metadata and official record links. It identifies CVE-2020-8193 as a Citrix authorization bypass vulnerability affecting ADC, Gateway, and SD-WAN WANOP appliances, with KEV dateAdded 2021-11-03 and dueDate 2022-05-03. No CVSS score or exploit write-up is included in the supplied data, so any deeper technical claims would be unsupported.

Official resources

CVE-2020-8193 was published in the supplied corpus on 2021-11-03 and was added to CISA KEV on the same date. The evidence supports treating it as a known exploited vulnerability; it does not establish the original vendor disclosure date.