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Exploited vulnerability · CISA KEV

Is CVE-2017-6316 exploited? Yes: in CISA KEV since 25 Mar 2022

Gociux · Citrix NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-6316, Citrix Multiple Products Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, 1709 days after it was published. It affects Citrix NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server, 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 · 25 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due15 Apr 2022BOD 22-01 deadline

What it is

A vulnerability has been identified in the management interface of Citrix NetScaler SD-WAN Enterprise and Standard Edition and Citrix CloudBridge Virtual WAN Edition that could result in an unauthenticated, remote attacker being able to execute arbitrary code as a root user. This vulnerability also affects XenMobile Server.

VendorCitrix (27 exploited CVEs in KEV)
ProductNetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server
VulnerabilityCitrix Multiple Products Remote Code Execution Vulnerability
WeaknessCWE-20
Published20 Jul 2017
Added to KEV25 Mar 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server 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 20 Jul 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Citrix.

References

Questions

Is CVE-2017-6316 being exploited?

Yes. CISA added CVE-2017-6316 to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-6316 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2017-6316?

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 NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server 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 March 2022 · Citrix scorecard · act-now radar.

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