Out-of-bounds Read in Citrix Netscaler_application_delivery_controller
CVE-2026-3055
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Vulnerability class: Buffer Overflow
EPSS: 0.840 (99.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: 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
- Citrix Netscaler_gateway
- Netscaler Adc — versions 14.1, 13.1, 13.1 FIPS and NDcPP
- Netscaler Gateway — versions 14.1, 13.1
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public proof-of-concept exploits
References
- 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-3055?
- CVE-2026-3055 is a critical-severity vulnerability in Citrix Netscaler_application_delivery_controller, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2026-03-23.
- How severe is CVE-2026-3055?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-3055 known to be exploited?
- Yes. CVE-2026-3055 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-30), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.