Threat Intelligence / CVE / CVE-2026-8452

CVE-2026-8452 — NetScaler ADC

CVSS v3.1 9.8 (CRITICAL) · CVSS v4.0 8.8 · EPSS 0.4% (higher than 38.3% of all scored CVEs) · Priority 6.4/10 · Published 2026-06-30

As of 2026-06-30, CVE-2026-8452 is a CRITICAL-severity vulnerability in NetScaler ADC, CVSS v3.1 9.8, EPSS 0.4% (38.3th percentile). Threadlinqs Intelligence links 3 tracked threat campaigns to CVE-2026-8452, most recently “CitrixBleed-Class NetScaler ADC/Gateway SAML AuthnRequest Memory Disclosure (CVE-2026-8451) Exploited Within 24 Hours of Disclosure”.

Last updated: 2026-06-30

What is CVE-2026-8452?

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

The record classifies CVE-2026-8452 under weakness class CWE-119. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 75 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score: 8.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L
EPSS (FIRST): 0.4% probability of exploitation in the next 30 days, higher than 38.3% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 6.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-30

Is CVE-2026-8452 being exploited?

No public exploitation evidence for CVE-2026-8452 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-06-30. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

NetScaler: ADC, Gateway

How to fix CVE-2026-8452

Vendor advisory: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-8452

3 tracked threats in the Threadlinqs corpus reference CVE-2026-8452, either in the campaign’s CVE list or as an indicator on the campaign record.

CitrixBleed-Class NetScaler ADC/Gateway SAML AuthnRequest Memory Disclosure (CVE-2026-8451) Exploited Within 24 Hours of Disclosure — CRITICAL · 2026-07-02
CVE-2026-8451: Memory Overread in Citrix NetScaler ADC/Gateway SAML IdP ('CitrixBleed'-class, CVSS 8.8) — Exploited Within 24 Hours of Disclosure — HIGH · 2026-07-02
CitrixBleed 2.0: CVE-2026-8451 NetScaler SAML IDP Memory Overread Under Active Exploitation — CRITICAL · 2026-06-30

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-02. This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

support.citrix.com

Full detection coverage & IOCs for threats exploiting CVE-2026-8452 are available via the Threadlinqs MCP server (Purple tier). View plans →

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