High severity · published Jun 30, 2026
CVE-2026-13474
Denial of service via malformed HTTP/2 requests
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NA
NetScaler ADC · Citrix
before 13.1-37.272; before 13.1-37.272; 13.1 before 13.1-63.18; 14.1 before 14.1-72.61; 14.1-66.68 · source: NVD
AD
ADC · NetScaler
14.1 before 72.61; 13.1 before 63.18; 14.1 FIPS before 72.61; 13.1 FIPS and NDcPP before 37.272 · source: vendor
GA
Gateway · NetScaler
14.1 before 72.61; 13.1 before 63.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13474
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-13474
Vendor Advisory
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604
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