CVE-2026-78008: CWE-787 in WatchGuard Fireware OS
Description
CVE-2026-78008 is a buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI. It requires an authenticated administrator with network access to exploit. Successful exploitation can cause a denial of service (DoS) or potentially allow arbitrary code execution. The vulnerability affects specific versions of Fireware OS including 2025.0, 12.0, and 2026.3. The CVSS 4.0 score is 8.6, indicating high severity. No known exploits are reported in the wild. Patch availability is not confirmed from the provided data.
CVSS v4.0
Score 8.6high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-787) in WatchGuard Fireware OS arises from a buffer overflow in the Management Web UI component. An authenticated administrator with network access can send specially crafted network traffic to trigger the overflow, leading to denial of service or arbitrary code execution. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no user interaction, and high privileges required. The vulnerability affects versions 2025.0, 12.0, and 2026.3 of Fireware OS. No patch or remediation details are provided in the source data.
Potential Impact
An attacker with authenticated administrator access over the network can exploit this vulnerability to cause a denial of service or potentially execute arbitrary code on the affected Fireware OS device. This could disrupt network security functions or allow further compromise of the device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict administrative network access to trusted personnel only and monitor for unusual activity. Do not assume the vulnerability is mitigated without official vendor confirmation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-48wp-98wm-5fpp
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-78008"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a91a7d5acd9273b490657b4
Added to database: 08/28/2026, 15:23:01 UTC
Last enriched: 09/08/2026, 06:07:41 UTC
Last updated: 10/12/2026, 06:48:19 UTC
Views: 38
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.