Citrix just got CitrixBleed'd again. Exploited within 24 hours of patch. Your VPN is exposed.

Citrix patched NetScaler CVE-2026-8451 on June 30.

Attackers weaponized it within 24 hours.

This is the third "CitrixBleed" in two years. Same appliance. Same class of flaw. Same network edge position.

NetScaler ADC and Gateway sit between the internet and your internal network.

They handle remote access, traffic distribution, and authentication for thousands of organizations.

A memory overread vulnerability lets unauthenticated attackers read process memory.

Credentials. Session tokens. Certificate keys. All exposed.

The Dutch NCSC issued an urgent advisory. Lupovis confirmed active exploitation within one day of disclosure.

If your NetScaler was not patched by July 1, assume memory contents were accessed.

Rotate every credential that passed through or was stored on those appliances.

Audit for unauthorized admin accounts and modified configurations.

Network-segment your management interfaces immediately.

This is the pattern: patch ships, exploit follows within hours, enterprises lag for weeks.

Your patch cycle just became your attack surface.

Audit your NetScaler posture today.