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,

highCVSS 7.5CVE-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

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-06-30
Last updated: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-13474

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-134740.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-13474	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCitrix Products Multiple Vulnerabilitieshkcert
unknownAL26-016 - Vulnerability impacting Citrix NetScaler CVE-2026-8451cccs
high[UPDATE] [high] Citrix Systems NetScaler ADC and Gateway: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Citrix products (July 1, 2026)cert-fr-avis
unknownNCSC-2026-0216 [1.00] [M/H] Vulnerabilities fixed in Citrix Netscaler ADC and Netscaler Gatewayncsc-nl
criticalCitrix security advisory (AV26-645) – Update 1cccs

Recent advisories for Denial of service

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-42952: Previously, there was no throttling on repeated authentication attempts to the charging statio…nvd · 2026-07-10
highCVE-2026-39244: adm-zip before 0.5.18 is vulnerable to denial of service via a crafted ZIP file with a manipul…nvd · 2026-07-10
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-10
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-10
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-10
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-10