Cisco Stock Falls Following Critical Security Vulnerability Disclosure

Key Facts

1Cisco disclosed a critical vulnerability in its Secure Email Gateway with a severity rating of 9.8.

2Reports confirmed that the discovered vulnerability is currently under active exploitation by threat actors.

Cisco disclosed a critical vulnerability in its Secure Email Gateway with a severity rating of 9.8. Benzinga reported that the discovered flaw is currently under active exploitation by threat actors, leading to a decline in the company's shares.

CSCO closed at $113.64 on October 14, 2026, having reached a day high of $116.23 and a low of $113.25. The discovery of this high-severity vulnerability raises significant concerns regarding product security and potential remediation costs for the networking giant.