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CVE-2026-3055

Citrix NetScaler Out-of-Bounds Read

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 4.04%
  1. Published23 Mar 2026
  2. Added to CISA KEV30 Mar 2026
  3. Remediation due2 Apr 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 30 Mar 2026Federal remediation due: 2 Apr 2026

Description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-62.23 · ≥ 14.1 < 14.1-60.58 · ≥ 13.1 < 13.1-37.262
Citrix NetScaler Gateway≥ 13.1 < 13.1-62.23 · ≥ 14.1 < 14.1-60.58

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-62.23
Citrix NetScaler Gateway≥ 13.1-62.23

References

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Frequently asked

Is CVE-2026-3055 being actively exploited?

Yes. CVE-2026-3055 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 30 Mar 2026.

How severe is CVE-2026-3055?

CVE-2026-3055 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 4.04% probability of exploitation.

Which products are affected by CVE-2026-3055?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-3055?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-62.23, Citrix NetScaler Gateway 13.1-62.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-3055 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.