Vulnerability details
CVE-2026-103594
WatchGuard Fireware OS
Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution
CVSS 4.0
9.5Critical
Official description
A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.5Critical | 4.0 | CVEProject cvelistV5 (CNA) (WatchGuard) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| WatchGuard | Fireware OS | 12.12 ≤ v < 12.12.4 | CVEProject cvelistV5 (CNA) |
| WatchGuard | Fireware OS | 2026.2 ≤ v < 2026.4 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://psirt.watchguard.com/CVE-2026-103594 vendor-advisory
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Details
- Published
- 2026-10-27
- Last updated
- 2026-11-04
- State
- Published
- Assigner (CNA)
- WatchGuard
- Kolun priority
- 24 · Low
Exploit prediction (EPSS)
0.43%
Probability of exploitation in 30 days
37.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-121
- CWE-1284
- CWE-787