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.
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Vulnerability1 · 1 read
CVE-2026-111339
Memory overflow in NetScaler Application Firewall decompression
- CVSS 4.0
- 6.9 medium
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A memory overflow in Application Firewall data decompression and inspection affects Citrix NetScaler ADC and Citrix NetScaler Gateway. A local attacker with low privileges must get a user to interact with the appliance. Successful use can cause unpredictable or erroneous behavior or a denial of service, and may affect confidentiality and integrity.
What to do: Apply Citrix's update for CVE-2026-111339. Citrix has not listed affected or fixed builds for this flaw.
| 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 Application Firewall data decompression/inspection can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler ADC and Citrix NetScaler Gateway.
- Vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:L/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