Citrix NetScaler vulnerabilities: known CVEs & security history
Citrix · Network / Security · 7 tracked CVEs · 1 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Citrix NetScaler release lines — 7 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Citrix NetScaler's current status and the safe version to run.
Known Citrix NetScaler CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-4966⚡ exploited | critical | 9.4 | 100% | 2023 |
| CVE-2026-8655 | critical | 9.8 | 0% | 2026 |
| CVE-2026-8452 | critical | 9.8 | 0% | 2026 |
| CVE-2026-8451 | high | 7.5 | 1% | 2026 |
| CVE-2026-13474 | high | 7.5 | 0% | 2026 |
| CVE-2026-10817 | high | 7.5 | 0% | 2026 |
| CVE-2026-10816 | high | 7.5 | 0% | 2026 |
Is my Citrix NetScaler version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Citrix NetScaler version → · Monitor Citrix NetScaler for new CVEs →
Citrix NetScaler vulnerabilities — frequently asked
How many known vulnerabilities does Citrix NetScaler have?
IsItPatched tracks 7 CVEs for Citrix NetScaler, 1 of which is actively exploited (CISA KEV). 3 are critical-severity and 4 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Citrix NetScaler have any actively-exploited vulnerabilities?
Yes — 1 Citrix NetScaler CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild (1 linked to ransomware). Patch it as a priority.
What is the most severe Citrix NetScaler vulnerability?
Among tracked issues, CVE-2023-4966 (CRITICAL, CVSS 9.4), which is actively exploited, ranks highest — a Memory corruption weakness.
Is Citrix NetScaler safe to use?
It depends on the version. The latest supported Citrix NetScaler release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Citrix NetScaler security status · Citrix NetScaler end-of-life · actively-exploited CVEs. Always verify against Citrix's advisories — see our disclaimer.