Cisco Zero-Day Vulnerability Exploited in Cyberattacks on Federal Networks

Cisco Zero-Day Vulnerability Exploited in Cyberattacks on Federal Networks

First seen 28 Feb 2026, 15:09 UTC •Forbes •78% similarity •92.3

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Cisco has confirmed a critical zero-day vulnerability, rated 10/10, that allows authentication bypass. The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about ongoing cyberattacks exploiting this vulnerability, which primarily targets federal networks. Immediate action is required to mitigate the threat posed by these attacks.

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Timeline

2026-02-26
CISA issues emergency warning about zero-day vulnerability
2026-02-28
Cisco confirms 10/10 vulnerability and ongoing attacks

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