Potential Vulnerability in Cisco Products Affects Security Systems
CVE-2025-20393

10CRITICAL

Key Information:

Vendor: Cisco
Status: Cisco Secure Email; Cisco Secure Email And Web Manager
Vendor: CVE Published:; 17 December 2025

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What is CVE-2025-20393?

CVE-2025-20393 is a critical vulnerability identified in Cisco products, specifically impacting their security systems. Cisco’s solutions are widely utilized in various organizational environments to safeguard network infrastructure and data integrity. This vulnerability poses significant risks as it may allow unauthorized access or manipulation of security systems, leading to potential system compromise. The exact technical details of the flaw are still under investigation by Cisco, but the presence of this vulnerability could disrupt security protocols and expose sensitive information, affecting an organization’s overall cybersecurity posture.

Potential impact of CVE-2025-20393

Unauthorized Access: Exploitation of this vulnerability could enable attackers to gain unauthorized access to affected systems, compromising sensitive data and leading to unauthorized configuration changes.
System Compromise: The vulnerability may allow threat actors to manipulate or control security mechanisms, providing a pathway for further compromises within the network and potentially spreading malware.
Operational Disruption: By affecting core security systems, this vulnerability could lead to significant operational disruptions, impacting business continuity and trust in organizational security measures.

CISA has reported CVE-2025-20393

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2025-20393 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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