Akira Ransomware Targets SonicWall VPNs in Likely Zero-Day Attack on Fully-Patched Devices

TL;DR

In late July 2025, Akira ransomware exploited SonicWall SSL VPN devices in a probable zero-day attack, targeting fully-patched devices. This surge in activity highlights the ongoing threat of ransomware and the importance of robust cybersecurity measures.

Akira Ransomware Exploits SonicWall VPNs in Zero-Day Attack

SonicWall SSL VPN devices have become the target of Akira ransomware attacks in a new wave of activity observed in late July 2025. These attacks, which likely exploit a zero-day vulnerability, have been seen targeting fully-patched devices, underscoring the persistent threat of ransomware.

Key Findings

• Multiple Intrusions: Researchers at Arctic Wolf Labs observed multiple pre-ransomware intrusions within a short period, each involving VPN access through SonicWall SSL VPNs¹.
• Zero-Day Exploit: The attacks suggest a zero-day vulnerability, as they targeted devices that were fully patched.
• Rapid Escalation: The swift succession of intrusions indicates a coordinated effort by the attackers.

Implications for Cybersecurity

This incident highlights several critical points for cybersecurity professionals:

• Patch Management: Even fully-patched devices can be vulnerable to zero-day exploits. Continuous monitoring and prompt response to new threats are essential.
• Ransomware Threat: The ongoing evolution of ransomware tactics underscores the need for robust defense strategies.
• VPN Security: Organizations must ensure that their VPN solutions are secure and regularly updated to mitigate such risks.

Expert Insights

Julian Tuin, a researcher at Arctic Wolf Labs, noted the sophistication of the attacks:

In the intrusions reviewed, multiple pre-ransomware intrusions were observed within a short period of time, each involving VPN access through SonicWall SSL VPNs.

This observation emphasizes the need for vigilant cybersecurity practices and proactive threat detection.

Conclusion

The Akira ransomware attacks on SonicWall VPNs serve as a reminder of the ever-evolving landscape of cyber threats. Organizations must remain vigilant and adapt their security measures to counter new and emerging risks.

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References

1. (2025-08-02). “Akira Ransomware Exploits SonicWall VPNs in Likely Zero-Day Attack on Fully-Patched Devices”. The Hacker News. Retrieved 2025-08-02. ↩︎