Skip to content
skopnix
Dossier · Vulnerability

Actively exploited · CISA KEV · NVD published 2023-10-10

CVE-2023-4966

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA  virtual server.

  1. First PoC
  2. 3 days →Metasploit
  3. 1086 days →First cited attacker

Signals

Exploited in the wild
Yesadded 2023-10-18 · due 2023-11-08 · known ransomware use. An observation, not a forecast.
EPSS · 30-day forecast
100.0%Chance of exploitation in the next 30 days, 100th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · CRITICAL
9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Internet exposure
not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

16 known · links only

GitHub PoCs · by trust, then stars14

  1. Chocapikk/CVE-2023-4966 ↗Trust ok 100

    Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

    ★ 78 · created 2023-10-24

  2. dinosn/citrix_cve-2023-4966 ↗Trust ok 100

    Citrix CVE-2023-4966 from assetnote modified for parallel and file handling

    ★ 10 · created 2023-10-25

  3. RevoltSecurities/CVE-2023-4966 ↗Trust ok 100

    An Exploitation script developed to exploit the CVE-2023-4966 bleed citrix information disclosure vulnerability

    ★ 10 · created 2023-10-29

  4. mlynchcogent/CVE-2023-4966-POC ↗Trust ok 100

    Proof Of Concept for te NetScaler Vuln

    ★ 8 · created 2023-10-25

  5. certat/citrix-logchecker ↗Trust ok 100

    Parse citrix netscaler logs to check for signs of CVE-2023-4966 exploitation

    ★ 5 · created 2023-10-28

  6. morganwdavis/overread ↗Trust ok 100

    Simulates CVE-2023-4966 Citrix Bleed overread bug

    ★ 2 · created 2023-12-16

  7. IceBreakerCode/CVE-2023-4966 ↗Trust ok 100

    ★ 1 · created 2023-10-25

  8. 0xKayala/CVE-2023-4966 ↗Trust ok 100

    CVE-2023-4966 - NetScaler ADC and NetScaler Gateway Memory Leak Exploit

    ★ 0 · created 2023-10-27

  9. akshthejo/CVE-2023-4966-exploit ↗Trust ok 100

    CVE-2023-4966-exploit

    ★ 0 · created 2024-12-18

  10. byte4RR4Y/CVE-2023-4966 ↗Trust ok 100

    Programm to exploit a range of ip adresses

    ★ 0 · created 2023-11-27

  11. jmussmann/cve-2023-4966-iocs ↗Trust ok 100

    Python script to search Citrix NetScaler logs for possible CVE-2023-4966 exploitation.

    ★ 0 · created 2023-12-08

  12. LucasOneZ/CVE-2023-4966 ↗Trust ok 100

    ★ 0 · created 2024-09-09

  13. s-bt/CVE-2023-4966 ↗Trust ok 100

    Scripts to get infos

    ★ 0 · created 2023-11-20

  14. vignesh-hp/LockBit-Ransomware-Analysis ↗Trust ok 100

    Threat intelligence and incident response case study on LockBit ransomware exploiting CVE-2023-4966 (Citrix Bleed).

    ★ 0 · created 2026-02-25

Fake proof-of-concept repositories have been used to deliver malware to the researchers who run them. The trust verdict is our engine's heuristic over the repository (account age, what it ships, how its stars arrived); it is a reason to read the code first, not a finding about its author.

Metasploit1

  1. Citrix ADC (NetScaler) Bleed Scanner ↗

    This module scans for a vulnerability that allows a remote, unauthenticated attacker to leak memory for a target Citrix ADC server. The leaked memory is then scanned for session cookies which can be hijacked if found.

    ruby · seen 2026-10-18

Nuclei1

  1. Citrix Bleed - Leaking Session Tokens ↗

    Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA ?virtual?server.

    yaml · seen 2026-10-18

On the wire

0 dispatches

No dispatch on our wire has named this CVE yet.

Watch this one?

KEV additions reach Telegram and the KEV-only RSS as they land.

Follow on TelegramKEV RSSAPI

Check your stack

Paste what you run: the CVEs exploited in the wild against it, and who is cited as exploiting them, with the report.

Stack checkNo key. No signup.