CVE-2025-20393 - PatchNow

Data Source: CIRCL

Confidence: HIGH

Exploitation Method: DIRECT_NETWORK

CVE Published: 2025-12-17

Added to CISA KEV: 2025-12-17 0 DAY BETWEEN CVE AND KEV

CRITICAL: Check for indicators of compromise - this vulnerability is in CISA KEV indicating active exploitation in the wild. Review logs, check for unauthorized access, verify system integrity
Apply emergency patches immediately for all Cisco Secure Email Gateway and Manager appliances
Monitor network traffic to/from email security appliances for suspicious activity
Review authentication logs and system integrity on affected appliances
Consider temporarily isolating affected systems if patches cannot be applied immediately
Implement additional network monitoring and access controls around email security infrastructure

Based on the search results, here's what is known about the CVE-2025-20393 vulnerability exploitation:

CISA KEV Status: CISA has added a new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation ^[2]^[3].
Active Exploitation: CISA added CVE-2025-20393 to the KEV catalog due to evidence of active exploitation ^[2].
Internet-Facing Applications: One source mentions that a vulnerability degrades security for public exposed endpoints and may offer arbitrary local file inclusion ^[1].
Attack Vectors: Frequent attack vectors for malicious cyber actors pose significant risks ^[3]^[4].

The provided search results do not offer specific details regarding:

Whether CVE-2025-20393 specifically affects internet-facing applications or services.
Specific attack vectors and exploitation methods for CVE-2025-20393.
Whether CVE-2025-20393 has been used in targeted attacks.
Technical details about internet exploitability for CVE-2025-20393.

Known Exploited Vulnerabilities Catalog - CISA
This vulnerability degrades security for public exposed endpoints that may make use of it and may offer arbitrary local file inclusion when provided a specially ...Read more…
CISA Adds One Known Exploited Vulnerability to Catalog
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.Read more…
CISA Adds One Known Exploited Vulnerability to Catalog | CISA
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2025-6554 Google Chromium V8 Type Confusion Vulnerability. These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significa…
CISA Adds Two Known Exploited Vulnerabilities to Catalog | CISA
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2025-48927 TeleMessage TM SGNL Initialization of a Resource with an Insecure Default Vulnerability.These types of vulnerabilities are frequent attack vectors for…

🔴 CVE-2025-20393