Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass Vulnerability
Citrix · Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
Citrix ADC and Citrix Gateway (versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18), along with Citrix SDWAN WAN-OP appliances (versions before 11.1.1a, 11.0.3d and 10.2.7), contain an improper access control flaw that lets requests reach certain URL endpoints without authentication. An unauthenticated attacker with network access to the affected appliance can reach those endpoints directly, with no user interaction or special configuration required.
Improper access control in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allows unauthenticated access to certain URL endpoints.
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 4/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 2 months after disclosure. Public exploit code (PoC-in-GitHub) was available the same day.
- First seen exploitedVulnCheck KEV evidence+2 mo
- Added to CISA KEVEU database agrees+16 mo
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 2PersistenceTA0003
CVE-2020-8193 is an Authorization Bypass vulnerability in Citrix ADC, Gateway, and SD-WAN WANOP Appliance in various versions allows attacker to bypass authentication mechanisms via crafted requests.
CollectionTA0009
Detection
1 rule for this CVE · 26 general rules for its techniquesRules for this CVE
1Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2020-8193 directly.General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Modify Authentication ProcessT155612 general rules
- AWS Identity Center Identity Provider Changehightest
- Directory Service Restore Mode(DSRM) Registry Value Tamperinghightest
- Github High Risk Configuration Disabledhightest
- Possible Shadow Credentials Addedhightest
- CA Policy Removed by Non Approved Actormediumtest
- CA Policy Updated by Non Approved Actormediumtest
- Certificate-Based Authentication Enabledmediumtest
- Change to Authentication Methodmediumtest
Data from Local SystemT100514 general rules
- OpenCanary - SMB File Open Requesthightest
- Potential Conti Ransomware Database Dumping Activity Via SQLCmdhightest
- SQLite Chromium Profile Data DB Accesshightest
- SQLite Firefox Profile Data DB Accesshightest
- VeeamBackup Database Credentials Dump Via Sqlcmd.EXEhightest
- Script Interpreter Spawning Credential Scanner - Linuxhighexperimental
- Script Interpreter Spawning Credential Scanner - Windowshighexperimental
- Shai-Hulud NPM Package Malicious Exfiltration via Curlhighexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX