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Exploited vulnerability · CISA KEV

Is CVE-2019-19781 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-19781, Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 677 days after it was published. It is known to be used in ransomware campaigns. It affects Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

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.

VendorCitrix (27 exploited CVEs in KEV)
ProductApplication Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
VulnerabilityCitrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability
WeaknessCWE-22
Published27 Dec 2019
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance in your asset inventory, including appliances and cloud images. Stack check lists every exploited Citrix CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Dec 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Citrix.

Other exploited CVEs in Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance

References

Questions

Is CVE-2019-19781 being exploited?

Yes. CISA added CVE-2019-19781 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-19781 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2019-19781?

Apply updates per vendor instructions. Check Citrix's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Citrix scorecard · act-now radar.

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