Known Exploited Vulnerability
9.4
CRITICAL
CVE-2023-4966
Citrix NetScaler ADC and NetScaler Gateway Buffer - [Actively Exploited]
Description

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. 

INFO

Published Date :

Oct. 10, 2023, 2:15 p.m.

Last Modified :

Aug. 14, 2024, 5:01 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.5

Exploitability Score :

3.9
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Required Action :

Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.

Notes :

https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967

Public PoC/Exploit Available at Github

CVE-2023-4966 has a 28 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2023-4966 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Citrix netscaler_application_delivery_controller
2 Citrix netscaler_gateway
: Total Affected Vendor : 1 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-4966.

URL Resource
http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html Third Party Advisory VDB Entry
https://support.citrix.com/article/CTX579459 Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
LucasOneZ/CVE-2023-4966

None

Python

Updated: 1 week, 2 days ago
0 stars 0 fork 0 watcher
Born at : Sept. 9, 2024, 7:26 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
whoami13apt/files2

None

Updated: 4 months ago
0 stars 0 fork 0 watcher
Born at : May 16, 2024, 2:53 p.m. This repo has been linked 48 different CVEs too.
Profile Photo
laasso/FlipperZero

Flipper Zero payloads and configs!

Python Shell HTML JavaScript PowerShell TeX

Updated: 1 week, 5 days ago
0 stars 0 fork 0 watcher
Born at : May 2, 2024, 4:53 p.m. This repo has been linked 2 different CVEs too.
Profile Photo
d4n-sec/d4n-sec.github.io

None

CSS HTML JavaScript

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 2, 2024, 2:11 p.m. This repo has been linked 494 different CVEs too.
Profile Photo
B0lg0r0v/citrix-netscaler-forensics

This repository contains a list of artifacts to search for while performing a forensic investigation on Citrix Netscaler appliances.

citrix-adc citrix-netscaler forensic-analysis guide citrix-adc-forensics malware

Shell

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Jan. 26, 2024, 9:18 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
morganwdavis/overread

Simulates CVE-2023-4966 Citrix Bleed overread bug

C

Updated: 4 months, 3 weeks ago
2 stars 0 fork 0 watcher
Born at : Dec. 16, 2023, 9:55 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
jmussmann/cve-2023-4966-iocs

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

Python

Updated: 9 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : Dec. 8, 2023, 10:28 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
byte4RR4Y/CVE-2023-4966

Programm to exploit a range of ip adresses

Go

Updated: 9 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Nov. 27, 2023, 9:51 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
s-bt/CVE-2023-4966

Scripts to get infos

PowerShell

Updated: 9 months, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : Nov. 20, 2023, 5:32 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
CerTusHack/Citrix-bleed-Xploit

None

Python

Updated: 10 months ago
2 stars 1 fork 1 watcher
Born at : Nov. 13, 2023, 4:39 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
venkycs/cy8

None

HTML Python

Updated: 5 months, 1 week ago
1 stars 1 fork 1 watcher
Born at : Nov. 5, 2023, 2:50 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
RevoltSecurities/CVE-2023-4966

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

Python

Updated: 2 months, 1 week ago
9 stars 0 fork 0 watcher
Born at : Oct. 29, 2023, 3:31 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
nanoRoot1/Herramientas-de-Seguridad-Digital

Herramientas

Python

Updated: 10 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Oct. 29, 2023, 2:21 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
certat/citrix-logchecker

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

Perl

Updated: 2 months, 3 weeks ago
6 stars 0 fork 0 watcher
Born at : Oct. 28, 2023, 11:44 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
0xKayala/CVE-2023-4966

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

Python

Updated: 10 months, 3 weeks ago
0 stars 1 fork 1 watcher
Born at : Oct. 27, 2023, 11 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-4966 vulnerability anywhere in the article.

  • Cybersecurity News
Citrix Workspace App Users Urged to Update Following Two Privilege Escalation Flaws

In a security advisory released recently, Cloud Software Group has disclosed two vulnerabilities affecting the widely used Citrix Workspace app for Windows. These vulnerabilities, identified as CVE-20 ... Read more

Published Date: Sep 13, 2024 (5 days, 18 hours ago)
CVE-2024-7890 CVE-2024-7889 CVE-2024-45032 CVE-2024-35783 CVE-2024-33698 CVE-2024-7261 CVE-2024-43202 CVE-2024-38063 CVE-2024-6387 CVE-2024-1024 ...+1 more CVE
  • Google Cloud
Ransomware Rebounds: Extortion Threat Surges in 2023, Attackers Rely on Publicly Available and Legitimate Tools

Written by: Bavi Sadayappan, Zach Riddle, Jordan Nuce, Joshua Shilko, Jeremy Kennelly A version of this blog post was published to the Mandiant Advantage portal on April 18, 2024. Executive Summary In ... Read more

Published Date: Jun 03, 2024 (3 months, 2 weeks ago)
CVE-2023-22518 CVE-2023-46604 CVE-2023-4966 CVE-2023-40044 CVE-2023-20269 CVE-2023-3519 CVE-2023-3539 CVE-2023-28252 CVE-2023-24880 CVE-2022-47966 ...+11 more CVE

The following table lists the changes that have been made to the CVE-2023-4966 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Aug. 14, 2024

    Action Type Old Value New Value
    Changed Description 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.  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. 
  • CVE Modified by [email protected]

    Aug. 02, 2024

    Action Type Old Value New Value
    Changed Description 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.  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. 
  • Modified Analysis by [email protected]

    Jun. 17, 2024

    Action Type Old Value New Value
    Changed Description 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.  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. 
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 29, 2024

    Action Type Old Value New Value
    Changed Description 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.  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. 
  • Modified Analysis by [email protected]

    Jan. 09, 2024

    Action Type Old Value New Value
    Changed Description 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.  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. 
    Changed Reference Type http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html No Types Assigned http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Changed Description 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.  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. 
  • CVE Modified by [email protected]

    Oct. 25, 2023

    Action Type Old Value New Value
    Changed Description 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.  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. 
    Added Reference http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Oct. 18, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://support.citrix.com/article/CTX579459 No Types Assigned https://support.citrix.com/article/CTX579459 Vendor Advisory
    Added CWE NIST NVD-CWE-noinfo
    Added CPE Configuration OR *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 12.1 up to (excluding) 12.1-55.300 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* versions from (including) 12.1 up to (excluding) 12.1-55.300 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 13.0 up to (excluding) 13.0-92.19 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 13.1 up to (excluding) 13.1-37.164 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 13.1 up to (excluding) 13.1-49.15 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 14.1 up to (excluding) 14.1-8.50 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 13.0 up to (excluding) 13.0-92.19 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 13.1 up to (excluding) 13.1-49.15 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 14.1 up to (excluding) 14.1-8.50
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

97.08 }} -0.01%

score

0.99813

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: