CVE-2019-19781
CVE-2019-19781 is a critical-severity vulnerability in Citrix Application Delivery Controller Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-22.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 100% (100th percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
- EU (EUVD) id: EUVD-2019-9380
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
- Weakness: CWE-22
- Affected product: Citrix Application Delivery Controller Firmware
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2019-19781?
- 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.
- How severe is CVE-2019-19781?
- CVE-2019-19781 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-19781 being actively exploited?
- Yes. CVE-2019-19781 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2019-19781?
- CVE-2019-19781 primarily affects Citrix Application Delivery Controller Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-19781?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2019-19781 have an EU (EUVD) identifier?
- Yes. CVE-2019-19781 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-9380. It is also flagged as exploited in the EUVD (since 2021-11-03).
- When was CVE-2019-19781 published?
- CVE-2019-19781 was published on 2019-12-27 and last updated on 2026-08-12.
References
- http://packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.html
- http://packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/155947/Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/155972/Citrix-ADC-Gateway-Path-Traversal.html
- https://badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/
- https://forms.gle/eDf3DXZAv96oosfj6
- https://support.citrix.com/article/CTX267027
- https://twitter.com/bad_packets/status/1215431625766424576
- https://www.kb.cert.org/vuls/id/619785
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-19781
Affected products (10)
- cpe:2.3:o:citrix:application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:application_delivery_controller_firmware:11.1:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:application_delivery_controller_firmware:12.0:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:application_delivery_controller_firmware:12.1:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:application_delivery_controller_firmware:13.0:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:netscaler_gateway_firmware:11.1:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:netscaler_gateway_firmware:12.0:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:netscaler_gateway_firmware:12.1:*:*:*:*:*:*:*
- cpe:2.3:o:citrix:gateway_firmware:13.0:*:*:*:*:*:*:*
More vulnerabilities in Citrix Application Delivery Controller Firmware
- CVE-2022-27518 — Critical (CVSS 9.8): Unauthenticated remote arbitrary code execution
- CVE-2022-27510 — Critical (CVSS 9.8): Unauthorized access to Gateway user capabilities
- CVE-2019-18225 — Critical (CVSS 9.8): An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway before 10.5 build 70.8, 11.x before…
- CVE-2018-7218 — Critical (CVSS 9.8): The AppFirewall functionality in Citrix NetScaler Application Delivery Controller and NetScaler Gateway 10.5 before…
- CVE-2020-8247 — High (CVSS 8.8): Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix…
- CVE-2020-8197 — High (CVSS 8.8): Privilege escalation vulnerability on Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21,…
All CVEs affecting Citrix Application Delivery Controller Firmware →
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