CVE-2023-4966

9.4 CRITICAL 100% exploit odds Drop everything exploited in the wild Fix listed Memory safety Network gear

What it is

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA  virtual server.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-09-14 15:51 UTC ReservedThe CVE id was reserved by its CNA
2023-10-10 14:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2023-10-18 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2023-11-08 Remediation deadlineCISA's due date for federal agencies to fix it
2026-07-31 04:16 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 100.0% in the next 30 days (EPSS).
Severity: 9.4 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2023-10-10 14:15 UTC
Last modified: 2026-07-31 04:16 UTC
Added to CISA KEV: 2023-10-18
Exploit probability: 100.0% · EPSS, next 30 days
Weakness: CWE-119 · Buffer errors
Record status: Analyzed

Affected

Citrix Netscaler Application Delivery Controller < 12.1-55.300
Citrix Netscaler Application Delivery Controller < 13.0-92.19
Citrix Netscaler Application Delivery Controller < 13.1-37.164
Citrix Netscaler Application Delivery Controller < 13.1-49.15
Citrix Netscaler Application Delivery Controller < 14.1-8.50
Citrix Netscaler Gateway < 13.0-92.19
Citrix Netscaler Gateway < 13.1-49.15
Citrix Netscaler Gateway < 14.1-8.50

Attack profile CVSS 3.1 · 9.4

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: Low

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-4966.md and follow it. Check whether this project is affected by CVE-2023-4966. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record