Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service
Priority LOW 31CWE-122Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.
Summary
A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00407 35th percentileScored 2026-11-07
Fix Fixed Fireware OS (WatchGuard): 2026.2.1, 12.12.1, 12.11.9 +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| WatchGuard | Fireware OS | 2025.0 to before 2026.2.1; 12.0 to before 12.12.1 | 2026.2.1, 12.12.1 | Patch available | CNA |
| WatchGuard | Fireware OS | 12.0 to before 12.11.9 | 12.11.9 | Patch available | CNA |
| WatchGuard | Fireware OS | 12.0 to before 12.5.18 | 12.5.18 | Patch available | CNA |
- Fireware OS VendorWatchGuard Affected 2025.0 to before 2026.2.1; 12.0 to before 12.12.1 Fixed in 2026.2.1, 12.12.1 Patch available CNA
- Fireware OS VendorWatchGuard Affected 12.0 to before 12.11.9 Fixed in 12.11.9 Patch available CNA
- Fireware OS VendorWatchGuard Affected 12.0 to before 12.5.18 Fixed in 12.5.18 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* | — | — | WatchGuard |
- cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* Versions — — ·WatchGuard
Remediation
- Fix · CNA Fireware OS (WatchGuard) Fixed in 2026.2.1, 12.12.1
- Fix · CNA Fireware OS (WatchGuard) Fixed in 12.11.9
- Fix · CNA Fireware OS (WatchGuard) Fixed in 12.5.18
Timeline
- 2026-10-02 Threatist record created from CVE-2026-81851
- 2026-10-03 Alias added: GHSA-vjp6-wxgv-jj73
References
More WatchGuard vulnerabilities
- TI-2022-09698 On WatchGuard Firebox and XTM appliances, an unauthenticated user can execute arbitrary… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-13451 WatchGuard Firebox iked Out of Bounds Write Vulnerability KEVCVSS 4.0CRITICAL 9.3
- TI-2025-08474 WatchGuard Firebox iked Out of Bounds Write Vulnerability KEVCVSS 4.0CRITICAL 9.3
- TI-2022-07330 WatchGuard Firebox and XTM appliances allow a remote attacker with unprivileged… KEVCVSS 3.1HIGH 8.8
- TI-2023-19293 A DLL hijacking vulnerability in Panda Security VPN for Windows prior to version v15.14.8… CVSS 3.1MEDIUM 6.5
- TI-2015-04587 Watchguard XCS 9.2 and 10.0 before build 150522 allow remote authenticated users to… CVSS 2.0MEDIUM 6.5
Sources
- CVE-2026-81851 · CVE Program
- CVE-2026-81851 · NVD
- FIRST EPSS
- GHSA-vjp6-wxgv-jj73 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences