Michael D. Capellas, a director at Cisco Systems, Inc. (NASDAQ:CSCO), sold 10,850 shares at $77.13 each, retaining 146,368 shares.Cisco disclosed a significant cybersecurity issue, CVE-2025-20393, affecting its AsyncOS software used in Secure Email Gateway and Web Manager.Despite the cybersecurity concerns, Cisco's stock price increased to $78.42, with a market capitalization of approximately $309.8 billion.Cisco Systems, Inc. (NASDAQ:CSCO), a leading technology company known for its networking hardware, so ...

Core Insights - A group of Chinese government-backed hackers is exploiting a vulnerability in Cisco's products, targeting enterprise customers [1] - Cisco has not disclosed the number of affected customers, but security researchers estimate that hundreds may be at risk [2][3] Vulnerability Details - The vulnerability, identified as CVE-2025-20393, is a zero-day flaw, meaning it was discovered before patches were available [2] - Cisco's advisory indicates that the vulnerability exists in several products, including the Secure Email Gateway and Secure Email and Web Manager [5] - Systems are only vulnerable if they are internet-accessible and have the "spam quarantine" feature enabled, which is not the default setting [6] Impact Assessment - Shadowserver Foundation reports that the scale of exposure is likely in the hundreds, not thousands [2] - Censys has identified 220 internet-exposed Cisco email gateways as vulnerable [3] - Cisco's threat intelligence arm, Talos, indicates that the hacking campaign has been active since at least late November 2025 [8] Remediation Recommendations - Cisco advises customers to wipe and restore affected appliances to a secure state, as no patches are currently available [7]