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CVE-2025-6543— Memory overflow vulnerability leading to unintended control flow and Denial of Service

Quick assessment

Affected
NetScaler ADC
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Citrix NetScaler ADC和Citrix NetScaler Gateway都是美国Citrix公司的产品。Citrix NetScaler ADC是一个应用程序交付和安全性平台。Citrix NetScaler Gateway是一种安全远程访问的解决方案。 Citrix NetScaler ADC和Citrix NetScaler Gateway存在安全漏洞，该漏洞源于内存溢出，可能导致拒绝服务。

AI Predicted 9.8 Difficulty: Easy KEV EPSS 10.56% · P96
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I. Basic Information for CVE-2025-6543

Vulnerability Information
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Vulnerability Title
Memory overflow vulnerability leading to unintended control flow and Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Citrix NetScaler ADC和Citrix NetScaler Gateway 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Citrix NetScaler ADC和Citrix NetScaler Gateway都是美国Citrix公司的产品。Citrix NetScaler ADC是一个应用程序交付和安全性平台。Citrix NetScaler Gateway是一种安全远程访问的解决方案。 Citrix NetScaler ADC和Citrix NetScaler Gateway存在安全漏洞，该漏洞源于内存溢出，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
NetScaler ADC 14.1 ~ 47.46 -
NetScaler Gateway 14.1 ~ 47.46 -

II. Public POCs for CVE-2025-6543

# POC Description Source Link Shenlong Link
1 Script para determinar si Citrix es vulnerable al CVE-2025-6543 https://github.com/grupooruss/Citrix-cve-2025-6543 POC Details
2 Citrix Bleed 2 PoC https://github.com/seabed-atavism/CVE-2025-6543 POC Details
3 Multi-host, multi-port scanner and auditor for CVE-2025-6543-affected NetScaler devices. Supports SNMP and SSH enumeration with optional CSV reporting and exploit stubs. https://github.com/abrewer251/CVE-2025-6543_CitrixNetScaler_PoC POC Details
4 Citrix Bleed 2 PoC https://github.com/lex1010/CVE-2025-6543 POC Details
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III. Intelligence Information for CVE-2025-6543

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IV. Related Vulnerabilities

Same product: ADC
Same vendor: NetScaler
Same weakness: CWE-119

V. Comments for CVE-2025-6543

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