CVE-2026-18145
Watchguard Fireware: stack buffer overflow can lead to remote code execution
- Risk score
- 50/100
- CVSS
- 7.2 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 30 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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.
- Affected
- Watchguard Fireware
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Watchguard Fireware: Amber, patch this week. A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.
The flaws
- CVE-2026-18145: Stack buffer overflow can lead to remote code execution (CVSS 7.2 · EPSS 0%)
- CVE-2026-86131: Code injection (CVSS 9.8 · EPSS 0%)
- CVE-2026-86134: Null pointer dereference can lead to denial of service (CVSS 7.5 · EPSS 0%)
- CVE-2026-86104: Denial of service (CVSS 7.5 · EPSS 0%)
The fix
Fix: Apply the vendor's security update; see the linked advisory.
Who is exposed: Watchguard Fireware
Where it stands
- No known exploitation
Connects to
- Same weakness: Stack buffer overflow (CWE-121). 195 other warnings in 30 days
- Same product: Earlier Watchguard Fireware warnings. 10 in the last 90 days
Why it is Yellow
- CVSS 7.2 high
References
Original 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.
Last activity 30 Sep 2026. Patch Forecast updates every hour.