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Exploited vulnerability · CISA KEV

Is CVE-2022-27518 exploited? Yes: in CISA KEV since 13 Dec 2022

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

Yes. CVE-2022-27518, Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 13 Dec 2022, the day it was published. It affects Citrix Application Delivery Controller (ADC) and Gateway, 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 · 13 Dec 2022
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 Jan 2023BOD 22-01 deadline

What it is

Citrix Application Delivery Controller (ADC) and Gateway, when configured with SAML SP or IdP configuration, contain an authentication bypass vulnerability that allows an attacker to execute code as administrator.

VendorCitrix (27 exploited CVEs in KEV)
ProductApplication Delivery Controller (ADC) and Gateway
VulnerabilityCitrix Application Delivery Controller (ADC) and Gateway Authentication Bypass Vulnerability
WeaknessCWE-664
Published13 Dec 2022
Added to KEV13 Dec 2022
Reported by (CNA)Citrix

What to do

  1. Check whether you run it. Look for Application Delivery Controller (ADC) and Gateway 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 13 Dec 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for Citrix.

References

Questions

Is CVE-2022-27518 being exploited?

Yes. CISA added CVE-2022-27518 to the Known Exploited Vulnerabilities catalog on 13 Dec 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-27518 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-2022-27518?

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) and Gateway 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 December 2022 · Citrix scorecard · act-now radar.

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