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CRITICAL severity

CVE-2026-88775 — Netscaler Application Delivery Controller

CRITICAL

CVE-2026-88775 is a critical-severity (CVSS 9.8) CWE-120 vulnerability in citrix netscaler application delivery controller. A fix is available — see the affected versions and patch details below.

Memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before…

Published
Sep 27, 2026
Updated
Sep 28, 2026
Affected
2 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Sep 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs25th percentile — riskier than 25% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-88775 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 247,569 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.

This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service

Affected Products

2 products · 7 configurations
Application
netscaler application delivery controllercitrix
≥ 14.1-66.68 && ≤ 14.1-73.37
range
Application
netscaler gatewaycitrix
≥ 14.1 && < 14.1-73.37
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every citrix netscaler application delivery controller deployment and check each version against the affected-products list above.

  2. Fix

    Apply the citrix netscaler application delivery controller security patch or hotfix for CVE-2026-88775 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service
O3 Security · Runtime Protection

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CVE-2026-88775: Critical 9.8 severity | O3 Security