Citrix patches 28 NetScaler flaws, one critical on default installs
CVE-2026-120868, a CVSS 9.3 memory overflow, needs no login or special feature and can crash any unpatched appliance.
76
CVE-2026-111336
HTTP/2 memory overflow in Citrix NetScaler ADC and Gateway
- CVSS 4.0
- 8.3 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A memory overflow in HTTP/2 handling can cause unpredictable or erroneous behavior, or a denial of service, in Citrix NetScaler ADC and Citrix NetScaler Gateway. A remote attacker can trigger it over the network without authentication or user interaction when the required attack conditions are met. Impact is strongest on availability, with limited effects on confidentiality and integrity. Citrix has not listed affected builds.
What to do: Apply Citrix's update for CVE-2026-111336. No workaround is named.
| Product | Affected |
|---|---|
| Citrix NetScaler ADC | — |
| Citrix NetScaler Gateway | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
Memory overflow in HTTP/2 handling can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler ADC and Citrix NetScaler Gateway.
- Vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/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