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71,000+ WatchGuard Devices Vulnerable to Remote Code Execution Attacks

## WatchGuard Device Vulnerability Exposes Critical Security Risks

HBy Henry DaltonOct 21, 20251 min read

WatchGuard Device Vulnerability Exposes Critical Security Risks

The Shadowserver Foundation has identified over 71,000 internet-exposed WatchGuard devices operating on vulnerable versions of Fireware OS. The vulnerability, identified as CVE-2025-9242 , is due to an out-of-bounds write flaw within the IKEv2 implementation. This flaw allows potential remote code execution without authentication.

Initially disclosed earlier in 2025, the vulnerability highlights significant risks associated with unpatched firewall systems in enterprise environments where such devices function as critical security infrastructures.

Security researchers reported the vulnerability in WatchGuard’s Fireware OS versions prior to 12.10.3, impacting numerous models, including the Firebox T-series and M-series appliances. The issue arises during IKEv2 packet processing, where inadequate bounds checking could lead to memory corruption, enabling attackers to gain full device control and access internal networks.

Despite the release of patches in March 2025 by WatchGuard, a significant number of devices remain unpatched, exposing essential infrastructure to potential threats.

The Shadowserver Foundation has identified over 71,000 internet-exposed WatchGuard devices operating on vulnerable versions of Fireware OS.
Henry Dalton · Thehackingpost

On October 18, 2025, the Shadowserver Foundation reported over 71,000 vulnerable hosts worldwide, emphasizing the global scope of this issue. Their scans target ISAKMP traffic, essential for VPN connections, where the IKEv2 flaw is located. Data from Shadowserver, including anonymized IP addresses, is available to assist network defenders in identifying and addressing exposures.

The vulnerability has a CVSS v3.1 base score of 9.8, categorizing it as critical. Exploiting CVE-2025-9242 can facilitate severe attacks, including ransomware or data breaches, particularly in sectors heavily reliant on WatchGuard hardware, such as healthcare and finance.

WatchGuard advises immediate updates to Fireware OS 12.10.3 or later and recommends disabling IKEv2 where it is not necessary. Cybersecurity firms also suggest using security tools like Shodan or Shadowserver feeds to audit network perimeters.

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Given the increasing targeting of network perimeters amid geopolitical tensions, this incident underscores the importance of proactive defense strategies to safeguard against potential threats.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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