Vulnerability details
CVE-2026-86133
WatchGuard Fireware OS
Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service
CVSS 4.0
8.2High
Official description
An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 4.0 | CVEProject cvelistV5 (CNA) (WatchGuard) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| WatchGuard | Fireware OS | 12.0 ≤ v < 12.12.3 | CVEProject cvelistV5 (CNA) |
| WatchGuard | Fireware OS | 12.0 ≤ v < 12.5.21 | CVEProject cvelistV5 (CNA) |
| WatchGuard | Fireware OS | 2025.0 ≤ v < 2026.2.3 | CVEProject cvelistV5 (CNA) |
| WatchGuard | Fireware OS | 2026.3 ≤ v < 2026.3.2 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://psirt.watchguard.com/CVE-2026-86133 vendor-advisory
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Details
- Published
- 2026-09-30
- Last updated
- 2026-09-30
- State
- Published
- Assigner (CNA)
- WatchGuard
Exploit prediction (EPSS)
0.34%
Probability of exploitation in 30 days
28.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-1284
- CWE-191