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Exploited· due 2022-05-039.8criticalCriticalused in ransomware

CVE-2019-19781

Citrix Application Delivery Controller Firmware

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.

Exploitation status

  • CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
  • It is known to have been used in ransomware campaigns.
  • US federal civilian agencies are required to remediate it by 2022-05-03. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
  • A vendor advisory or patch reference has been published.

Required action

Apply updates per vendor instructions.

CISA’s wording, unedited.

What the metrics mean

  • It is reachable over a network, without needing local access.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, no account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
9.8 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-22
Assigned by
cve@mitre.org

Dates

Published
2019-12-27
Last modified
2026-08-12
Added to KEV
2021-11-03
Remediation due
2022-05-03
Sources
CISA KEV, NVD

Affected products

  • Citrix Application Delivery Controller Firmware10.5, 11.1, 12.0, 12.1, 13.0
  • Citrix Application Delivery Controllerall versions
  • Citrix Netscaler Gateway Firmware10.5, 11.1, 12.0, 12.1
  • Citrix Netscaler Gatewayall versions
  • Citrix Gateway Firmware13.0
  • Citrix Gatewayall versions

As listed in the NVD configuration data. Not a statement about your estate.

References