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-2026-111337
Memory overflow in NetScaler Base64 policy decoding
- CVSS 4.0
- 8.7 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A memory overflow in Base64 decoding used by advanced policy expressions can cause unpredictable or erroneous behavior or denial of service in Citrix NetScaler ADC and Citrix NetScaler Gateway. A remote attacker can trigger it over the network with no authentication and no user interaction. Impact is primarily loss of availability, with limited effects on confidentiality and integrity of subsequent systems. Affected versions are not listed.
What to do: Apply Citrix's update for CVE-2026-111337. No fixed version or workaround is stated.
| 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 Base64 decoding in advanced policy expressions leading 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:N/PR:N/UI:N/VC:N/VI:N/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