Critical

Critical F5 BIG-IP Vulnerability Exploited as Zero-Day

SecurityWeek

September 23, 2026 at 7:34 AM

Actively Exploited

Overview

A serious vulnerability in F5's BIG-IP application delivery controller has been identified, allowing unauthenticated attackers to send malicious traffic that could lead to remote code execution. This issue poses a significant risk as it can be exploited without authentication, making it easier for attackers to gain control of affected systems. Organizations using BIG-IP products need to act quickly to secure their systems, as this vulnerability is being actively exploited in the wild. F5 has not specified which versions are affected, but the urgency of the situation calls for immediate attention from IT departments to prevent potential breaches. Users should stay updated on patches and security advisories from F5 to mitigate this risk.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: F5 BIG-IP products, specific versions not specified
Action Required: Organizations should apply patches or updates as soon as they are available from F5.
Timeline: Newly disclosed

Original Article Summary

Unauthenticated attackers could send malicious traffic to BIG-IP to achieve remote code execution. The post Critical F5 BIG-IP Vulnerability Exploited as Zero-Day appeared first on SecurityWeek.

Impact

F5 BIG-IP products, specific versions not specified

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Organizations should apply patches or updates as soon as they are available from F5. Regularly check for security advisories and implement recommended security practices.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Zero-day, Vulnerability, Critical, and 1 more.

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