Threat Intelligence / CVE / CVE-2026-13474

CVE-2026-13474 — NetScaler ADC

CVSS v3.1 7.5 (HIGH) · CVSS v4.0 8.7 · EPSS 0.4% (higher than 32.3% of all scored CVEs) · Priority 5/10 · Published 2026-06-30

As of 2026-06-30, CVE-2026-13474 is a HIGH-severity vulnerability in NetScaler ADC, CVSS v3.1 7.5, EPSS 0.4% (32.3th percentile). Threadlinqs Intelligence links 3 tracked threat campaigns to CVE-2026-13474, 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-2026-13474?

Denial of service via malformed HTTP/2 requests in NetScaler ADC and NetScaler Gateway if HTTP/2 is enabled in HTTP Profile and associated with the virtual server (of type LB, CS, VPN) or the service configured on NetScaler

The record classifies CVE-2026-13474 under weakness class CWE-401. 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 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: 7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0 base score: 8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
EPSS (FIRST): 0.4% probability of exploitation in the next 30 days, higher than 32.3% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-30

Is CVE-2026-13474 being exploited?

No public exploitation evidence for CVE-2026-13474 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-2026-13474

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-2026-13474

3 tracked threats in the Threadlinqs corpus reference CVE-2026-13474, 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-2026-13474 are available via the Threadlinqs MCP server (Purple tier). View plans →

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