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Critical Vulnerability in Cisco Secure Email Products Added to CISA KEV Catalog

known exploited vulnerabilitiessecurity advisoryvulnerabilitysecurity updateattack vectorCISAcyberattacksCiscoactive exploitationrisk mitigationexploitzero-dayemail gatewaySpam Quarantinecritical
Updated December 21, 2025 at 06:01 AM9 sources

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A critical vulnerability, tracked as CVE-2025-20393, has been identified in Cisco Secure Email Gateway and Cisco Secure Email and Web Manager products running any version of AsyncOS with the Spam Quarantine feature enabled and exposed to the internet. Cisco released a security advisory detailing the flaw and urging administrators to review recommendations and apply necessary updates to mitigate the risk. The vulnerability allows for improper input validation, which could be exploited by malicious actors to compromise affected systems.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2025-20393 to its Known Exploited Vulnerabilities (KEV) Catalog, citing evidence of active exploitation. Federal agencies are required to remediate this vulnerability by the specified deadline, and CISA strongly encourages all organizations to prioritize patching to reduce exposure to cyberattacks. The inclusion of this vulnerability in the KEV Catalog highlights its significance as a frequent attack vector and underscores the urgent need for remediation across both public and private sectors.

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December 18, 2025 at 09:08 AM
December 18, 2025 at 12:00 AM

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