What is CVE-2026-8451?

CVE-2026-8451 is a high-severity vulnerability in Citrix Netscaler Application Delivery Controller, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-06-30.

How severe is CVE-2026-8451?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2026-8451 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Citrix Netscaler Application Delivery Controller

CVE-2026-8451

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

Vulnerability class: Buffer Overflow

EPSS: 0.157 (96.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Citrix Netscaler_application_delivery_controller — versions 14.1-66.68
Citrix Netscaler_gateway
Netscaler Adc — versions 14.1, 13.1, 14.1 FIPs
Netscaler Gateway — versions 14.1, 13.1

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

References

50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-8451?: CVE-2026-8451 is a high-severity vulnerability in Citrix Netscaler Application Delivery Controller, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-06-30.
How severe is CVE-2026-8451?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2026-8451 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.