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 29 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
J1ezds/Vulnerability-Wiki-page

这是一个每天同步Vulnerability-Wiki中docs-base中内容的项目

HTML

Updated: 1 month, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Sept. 20, 2024, 3:27 a.m. This repo has been linked 203 different CVEs too.
Profile Photo
LucasOneZ/CVE-2023-4966

None

Python

Updated: 1 month, 3 weeks 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: 5 months, 2 weeks 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 month, 4 weeks 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: 9 months 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: 9 months 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: 6 months, 1 week 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: 10 months, 4 weeks 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: 11 months, 1 week 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: 11 months, 2 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: 11 months, 2 weeks 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: 6 months, 3 weeks 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: 3 months, 3 weeks 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: 1 year 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: 4 months, 1 week 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.

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
New Threat Group UNC5820 Targets FortiManager Zero-Day CVE-2024-47575 in Global Cyberattack

In October 2024, Mandiant, in collaboration with Fortinet, uncovered the mass exploitation of FortiManager appliances across multiple industries. This zero-day vulnerability, designated as CVE-2024-47 ... Read more

Published Date: Oct 24, 2024 (1 week, 5 days ago)
CVE-2024-8312 CVE-2024-6826 CVE-2024-47575 CVE-2024-8015 CVE-2024-44193 CVE-2024-22170 CVE-2024-38178 CVE-2023-42659 CVE-2023-4966
  • Palo Alto Networks Blog
The Top 5 Largest Scale Intrusions in 2023

What Powered Them? Large-scale cyber intrusions increased during 2023, exploiting vulnerabilities in web applications and internet-facing software. Attackers favored this attack vector even more than ... Read more

Published Date: Oct 02, 2024 (1 month ago)
CVE-2023-4966 CVE-2023-34362 CVE-2023-22952 CVE-2021-44228 CVE-2020-14882
  • TheCyberThrone
Storm-0501 deploys Embargo Ransomware in Hybrid Cloud Environment

Security researchers from Microsoft has observed the threat actor tracked as Storm-0501 launching a multi-staged attack where they compromised hybrid cloud environments and performed lateral movement ... Read more

Published Date: Sep 30, 2024 (1 month ago)
CVE-2024-0132 CVE-2024-43917 CVE-2023-4966 CVE-2023-38203 CVE-2023-29300 CVE-2022-47966
  • Cybersecurity News
Storm-0501 Targets Hybrid Clouds with Evolving Ransomware Tactics

In a recent report from Microsoft Threat Intelligence, the cybercriminal group Storm-0501 has been identified as a rising threat, targeting hybrid cloud environments through a series of sophisticated ... Read more

Published Date: Sep 30, 2024 (1 month ago)
CVE-2024-38217 CVE-2024-20440 CVE-2024-20439 CVE-2024-38653 CVE-2024-23917 CVE-2023-4966 CVE-2023-38203 CVE-2023-29300 CVE-2022-47966
  • BleepingComputer
Embargo ransomware escalates attacks to cloud environments

Microsoft warns that ransomware threat actor Storm-0501 has recently switched tactics and now targets hybrid cloud environments, expanding its strategy to compromise all victim assets. The threat acto ... Read more

Published Date: Sep 27, 2024 (1 month, 1 week ago)
CVE-2023-4966 CVE-2023-38203 CVE-2023-29300 CVE-2022-47966
  • 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 (1 month, 3 weeks 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 (5 months 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 }} -0.04%

score

0.99824

percentile

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