Citrix Bleed (CVE-2023-4966) Exploitation
Exploitation of the Citrix NetScaler ADC/Gateway information-disclosure flaw (CVE-2023-4966) in 2023 to steal session tokens and pivot into enterprise environments.
Citrix Bleed (CVE-2023-4966) leaked NetScaler session tokens, letting attackers bypass multi-factor authentication and hijack existing user sessions on internet-exposed edge appliances in late 2023.
Definition
A buffer underflow in NetScaler ADC/Gateway that disclosed memory containing active session tokens; attackers used stolen tokens to authenticate as legitimate users without MFA, often focusing on financial-sector targets.
Why It Matters / Impact
Widespread exploitation reported from August 2023, including financial-sector breaches; CISA KEV added it in early 2024; remediation required both patching and session invalidation/token rotation.
Current Status
- Review status: published
- Last updated: 2026-08-26
- Evidence: 3 source(s) · 1 CVE(s) linked
- Confidence: 92%
Timeline
- 2023-08-01 — First observed exploitation (approx.)
- 2023-10-10 — Citrix discloses the memory-disclosure flaw
- 2023-12-01 — CISA adds to KEV; session token rotation advised
Sources
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