Denial of service via malformed HTTP/2 requests

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Summary

CVECVE-2026-13474
StatePUBLISHED
AssignerNetScaler
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-30 13:17:09 UTC
Updated2026-06-30 14:19:23 UTC
DescriptionDenial 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

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-401 | CWE-401 CWE-401 Missing release of memory after effective lifetime

VersionSourceTypeScoreSeverityVector
4.050a63c94-1ea7-4568-8c11-eb79e7c5a2b5Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
Low

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NetScaler ADC affected 14.1 72.61 patch Not specified
CNA NetScaler ADC affected 13.1 63.18 patch Not specified
CNA NetScaler ADC affected 14.1 FIPS 72.61 patch Not specified
CNA NetScaler ADC affected 13.1 FIPS and NDcPP 37.272 patch Not specified
CNA NetScaler Gateway affected 14.1 72.61 patch Not specified
CNA NetScaler Gateway affected 13.1 63.18 patch Not specified

References

ReferenceSourceLinkTags
support.citrix.com/support-home/kbsearch/article 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 support.citrix.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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