# CVE-2025-9242 — WatchGuard Fireware OS **CISA KEV** > As of 2026-08-10, CVE-2025-9242 is a CRITICAL-severity vulnerability in WatchGuard Fireware OS, CVSS v3.1 9.8, EPSS 91.3% (99.8th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-12), with a US federal remediation deadline of 2025-12-03. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-9242, most recently “WatchGuard Fireware OS Critical Code Injection Vulnerability in BOVPN over TLS Client (CVE-2026-86131)”. **Last updated:** 2026-08-10 ## What is CVE-2025-9242? 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. The record classifies CVE-2025-9242 under weakness class [CWE-787](https://intel.threadlinqs.com/cwe/CWE-787). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 402 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **CVSS v4.0 base score:** 9.3 (`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`) - **EPSS (FIRST):** 91.3% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs - **CISA KEV:** Listed since 2025-11-12, federal remediation deadline 2025-12-03 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2025-09-17, last modified 2026-08-10 ## Is CVE-2025-9242 being exploited? CISA added CVE-2025-9242 to the Known Exploited Vulnerabilities catalog on 2025-11-12, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-12-03 under BOD 22-01. Weaponised exploit code for CVE-2025-9242 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed. - [watchtowrlabs/watchTowr-vs-WatchGuard-CVE-2025-9242](https://github.com/watchtowrlabs/watchTowr-vs-WatchGuard-CVE-2025-9242) (github) - [trickest/cve](https://github.com/trickest/cve/blob/main/2025/CVE-2025-9242.md) (trickest) ## Affected products and versions - [WatchGuard](https://intel.threadlinqs.com/vendors/watchguard): Fireware OS ## How to fix CVE-2025-9242 Vendor advisory: [https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015](https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015). Because CVE-2025-9242 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-12-03. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory. ## Threat activity tracking CVE-2025-9242 1 tracked threat in the Threadlinqs corpus references CVE-2025-9242, either in the campaign’s CVE list or as an indicator on the campaign record. - [WatchGuard Fireware OS Critical Code Injection Vulnerability in BOVPN over TLS Client (CVE-2026-86131)](https://intel.threadlinqs.com/threat/TL-2026-2813) — CRITICAL · 2026-09-30 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [psirt.watchguard.com — vendor advisory](https://psirt.watchguard.com/CVE-2025-9242) - [watchguard.com — vendor advisory](https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015) Canonical: https://intel.threadlinqs.com/cve/CVE-2025-9242 Full detection coverage and IOCs for threats exploiting CVE-2025-9242 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp