CVE-2019-19781
KEVRansomware UseCitrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability
Description
Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an unspecified vulnerability that could allow an unauthenticated attacker to perform code execution.
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedDec 27, 2019
Last modifiedAug 12, 2026
Added to KEVNov 3, 2021
Remediation dueMay 3, 2022
References
- packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.htmlThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.htmlThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.htmlThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/155947/Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Execution.htmlThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/155972/Citrix-ADC-Gateway-Path-Traversal.htmlThird Party AdvisoryVDB Entry
- badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/Broken LinkThird Party Advisory
- forms.gle/eDf3DXZAv96oosfj6Third Party Advisory
- support.citrix.com/article/CTX267027Vendor Advisory
- twitter.com/bad_packets/status/1215431625766424576Broken LinkThird Party Advisory
- kb.cert.org/vuls/id/619785Third Party AdvisoryUS Government Resource
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-19781US Government Resource
0 recent articles mention this CVE
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Risk assessment · Critical
Actively exploited and used by ransomware crews. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1637 days
- Ransomware
- Used in known ransomware campaigns
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 100.0% · top 1% of all CVEs
- Weakness
- CWE-22
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
- 5.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.