CVE-2025-9242: WatchGuard Firebox Out-of-Bounds Write Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 56 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 92.2%
EPSS score, percentile 99.8 of all scored records
- How severe?
- 9.3 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Which versions are affected?
Affected
- 11.0 through 11.12.4+541730
- from 12.0 to before 12.11.4
- from 2025.0 to before 2025.1.1
- from 12.0 to before 12.3.1+722811
- from 12.0 to before 12.5.13
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: .
Solution (from the CVE record)
Fireware OS 2025.1.1, Fireware OS 12.11.4, Fireware OS 12.5.13, Fireware OS 12.3.1+722811
Workaround (from the CVE record)
If your Firebox is only configured with Branch Office VPN tunnels to static gateway peers and you are not able to immediately upgrade the device to a version of Fireware OS with the vulnerability resolution, you can follow WatchGuard’s recommendations for Secure Access to Branch Office VPNs that Use IPSec and IKEv2 as a temporary workaround.
Advisories and patches
Linked from CISA's catalog entry
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015
- https://nvd.nist.gov/vuln/detail/CVE-2025-9242
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 11.0 through 11.12.4+541730 |
| Affected | from 12.0 to before 12.11.4 |
| Affected | from 2025.0 to before 2025.1.1 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 12.0 to before 12.3.1+722811 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 12.0 to before 12.5.13 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
WatchGuard Firebox contains an out-of-bounds write vulnerability in the OS iked process that may allow a remote unauthenticated attacker to execute arbitrary code.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2025-9242 to its Known Exploited Vulnerabilities (KEV) catalog on 12 Nov 2025.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 3 Dec 2025.
- The CVE record was published on 17 Sep 2025, 56 days before it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 9.3 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 92.2% (percentile 99.8), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
WatchGuard Firebox iked Out of Bounds Write Vulnerability
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
More exploited WatchGuard vulnerabilities
- CVE-2025-14733: WatchGuard Firebox Out of Bounds Write Vulnerability
- CVE-2022-23176: WatchGuard Firebox and XTM Privilege Escalation Vulnerability
- CVE-2022-26318: WatchGuard Firebox and XTM Appliances Arbitrary Code Execution