Home/CVE/Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability
CVE

CVE-2019-19781

Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94442 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules11 YARA rules1
⬢

Required Remediation

Apply updates per vendor instructions.

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Threat Actors Linked

19
actorAgrius
actorAPT10
actorAPT29
actorAPT33
actorOilRig
actorAPT39
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
▤

Affected Products & Versions

3
citrix application delivery controller firmwareall versions
citrix netscaler gateway firmwareall versions
citrix gateway firmwareall versions
⚠

Public Exploits & PoCs

9
webappsCitrix Application Delivery Controller (ADC) and Gateway 13.0 - Path Traversal2020-01-16
webappsCitrix Application Delivery Controller and Gateway 10.5 - Remote Code Execution (Metasploit)2020-01-13
webappsCitrix Application Delivery Controller and Citrix Gateway - Remote Code Execution (PoC)2020-01-11
nucleiCitrix ADC and Gateway - Directory Traversalcritical
pocpacketstormsecurity.com · Citrix-Application-Delivery-Controller-Gateway-Remote-Cod...packetstormsecurity.com
pocpacketstormsecurity.com · Citrix-Application-Delivery-Controller-Gateway-Remote-Cod...packetstormsecurity.com
pocpacketstormsecurity.com · Citrix-Application-Delivery-Controller-Gateway-10.5-Remot...packetstormsecurity.com
pocpacketstormsecurity.com · Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Exec...packetstormsecurity.com
pocpacketstormsecurity.com · Citrix-ADC-Gateway-Path-Traversal.htmlpacketstormsecurity.com
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Detection Rules (IDS/IPS)

7
et-openET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781) M2attempted-admin
et-openET EXPLOIT Citrix App Delivery Controller and Citrix Gateway M1 (CVE-2019-19781)attempted-admin
et-openET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781)attempted-admin
et-openET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781) M4attempted-admin
et-openET EXPLOIT Citrix Application Delivery Controller Arbitrary Code Execution Attempt Scanner Attempt (CVE-2019-19781)attempted-admin
et-openET EXPLOIT Citrix Application Delivery Controller Arbitrary Code Execution Attempt Scanner Attempt - Server Response (CVE-2019-19781)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Sigma Hunt Rules

11
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumAzure Application Gateway Modified or Deleted
relatedcriticalBitbucket Unauthorized Full Data Export Triggered
relatedcriticalBitbucket Unauthorized Access To A Resource
relatedcriticalAntivirus Exploitation Framework Detection
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalAntivirus Ransomware Detection
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Dec 2019 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2019-19781
payloads-all-the-thingspayloads-all-the-things-CVE-Exploits-README
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/Broken LinkThird Party Advisory
https://forms.gle/eDf3DXZAv96oosfj6Third Party Advisory
https://support.citrix.com/article/CTX267027Vendor Advisory
https://twitter.com/bad_packets/status/1215431625766424576Broken LinkThird Party Advisory
https://www.kb.cert.org/vuls/id/619785Third Party AdvisoryUS Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-19781US Government Resource
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