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HomeCVEsCVE-2025-6543

CVE-2025-6543

Published: January 25, 2026
Last updated:21 hours ago (January 25, 2026)
Exploit: YesZero-day: YesPatch: YesTrend: Low
TL;DR
Updated January 25, 2026

CVE-2025-6543 is a critical severity vulnerability with a CVSS score of 9.8. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.

Key Points
  • 1Critical severity (CVSS 9.8/10)
  • 2EPSS: 3.00% - moderate likelihood of exploitation
  • 3Public exploits are available
  • 4Vendor patches are available
  • 5Strobes Priority Score: 906/1000 (Critical)
  • 6Affects products from: Citrix
Severity Scores
CVSS v39.8
CVSS v20.0
Priority Score906.0
EPSS Score3.0
Critical
Exploitation LikelihoodLow
3.00%EPSS

Lower probability of exploitation

Patch during regular maintenance
3.00%
EPSS
9.8
CVSS
Yes
Exploit
Yes
Patch
Critical Priority
exploit exists • critical severity • high priority

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

Description

Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

CVSS v3 Breakdown
Attack Vector:Network
Attack Complexity:Local
Privileges Required:Network
User Interaction:Network
Scope:Unchanged
Confidentiality:High
Integrity:High
Availability:High
Exploit References
Cisa.govGitHubGitHubGitHub
Patch References
[email protected]Zeroday CZ
Trend Analysis
Low
Vulnerable Products
VendorProduct
CitrixNetscaler Application Delivery Controller
CitrixNetscaler Gateway
Advisories
CISA: Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
GitHub AdvisoryNVD
Cite This Page
APA Format
Strobes VI. (2026). CVE-2025-6543 - CVE Details and Analysis. Strobes VI. Retrieved January 26, 2026, from https://vi.strobes.co/cve/CVE-2025-6543
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