Vulnerability details
CVE-2026-18145
WatchGuard Fireware OS
Fireware OS Stack-based Buffer Overflow in spamd Allows Remote Code Execution
CVSS 4.0
8.6High
Official description
A stack-based buffer overflow vulnerability in the spamBlocker (spamd) service of WatchGuard Fireware OS allows an authenticated attacker with administrator privileges to crash the service or potentially execute arbitrary code by sending a specially crafted management request.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 4.0 | CVEProject cvelistV5 (CNA) (WatchGuard) | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/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-2026-18145 vendor-advisory
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Details
- Published
- 2026-09-30
- Last updated
- 2026-10-01
- State
- Published
- Assigner (CNA)
- WatchGuard
Exploit prediction (EPSS)
0.38%
Probability of exploitation in 30 days
33.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-121