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Exploited vulnerability · CISA KEV

Is CVE-2026-3055 exploited? Yes: in CISA KEV since 30 Mar 2026

Gociux · Citrix NetScaler · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-3055, Citrix NetScaler Out-of-Bounds Read Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 30 Mar 2026, 7 days after it was published. It affects Citrix NetScaler, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 30 Mar 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.3CVSS 4.0 · critical
US federal due2 Apr 2026BOD 22-01 deadline

What it is

Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.

VendorCitrix (27 exploited CVEs in KEV)
ProductNetScaler
VulnerabilityCitrix NetScaler Out-of-Bounds Read Vulnerability
WeaknessCWE-125
Published23 Mar 2026
Added to KEV30 Mar 2026
Reported by (CNA)NetScaler

What to do

  1. Check whether you run it. Look for NetScaler in your asset inventory, including appliances and cloud images. Stack check lists every exploited Citrix CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  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 23 Mar 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Citrix.

Other exploited CVEs in NetScaler

References

Questions

Is CVE-2026-3055 being exploited?

Yes. CISA added CVE-2026-3055 to the Known Exploited Vulnerabilities catalog on 30 Mar 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-3055 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-2026-3055?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Citrix's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected NetScaler 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 2026 · Citrix scorecard · act-now radar.

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