CVE-2026-13371: CWE-502 Deserialization of Untrusted Data in WatchGuard Fireware OS
CVE-2026-13371 is a medium severity vulnerability in WatchGuard Fireware OS that allows an authenticated administrator to cause a denial-of-service (DoS) condition. The issue arises from unsafe deserialization of attacker-supplied input sent to the put_data endpoint in the Fireware Management Web UI. This vulnerability affects specific versions of Fireware OS and does not require user interaction beyond authentication.
AI Analysis
Technical Summary
This vulnerability involves unsafe deserialization of untrusted data (CWE-502) in the WatchGuard Fireware OS Management Web UI. An authenticated administrator can send malformed or crafted data to the put_data endpoint, triggering a denial-of-service condition. The CVSS 4.0 base score is 6.9, reflecting network attack vector, low attack complexity, no user interaction, and high impact on availability. No official patch or remediation level has been published by the vendor as of the data provided.
Potential Impact
Successful exploitation results in denial-of-service, disrupting the availability of the Fireware Management Web UI. The attacker must have authenticated administrator privileges to trigger this condition. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
No official patch or remediation guidance has been published by WatchGuard at this time. Since the vulnerability requires authenticated administrator access, restricting administrative access to trusted personnel and networks can reduce risk. Monitor vendor advisories for updates on patches or official mitigations.
CVE-2026-13371: CWE-502 Deserialization of Untrusted Data in WatchGuard Fireware OS
Description
CVE-2026-13371 is a medium severity vulnerability in WatchGuard Fireware OS that allows an authenticated administrator to cause a denial-of-service (DoS) condition. The issue arises from unsafe deserialization of attacker-supplied input sent to the put_data endpoint in the Fireware Management Web UI. This vulnerability affects specific versions of Fireware OS and does not require user interaction beyond authentication.
CVSS v4.0
Score 6.9medium
Affected software
pkg:github/watchguard/fireware-osRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves unsafe deserialization of untrusted data (CWE-502) in the WatchGuard Fireware OS Management Web UI. An authenticated administrator can send malformed or crafted data to the put_data endpoint, triggering a denial-of-service condition. The CVSS 4.0 base score is 6.9, reflecting network attack vector, low attack complexity, no user interaction, and high impact on availability. No official patch or remediation level has been published by the vendor as of the data provided.
Potential Impact
Successful exploitation results in denial-of-service, disrupting the availability of the Fireware Management Web UI. The attacker must have authenticated administrator privileges to trigger this condition. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
No official patch or remediation guidance has been published by WatchGuard at this time. Since the vulnerability requires authenticated administrator access, restricting administrative access to trusted personnel and networks can reduce risk. Monitor vendor advisories for updates on patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WatchGuard
- Date Reserved
- 2026-06-25T19:43:53.207Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a46f27f27e9c797194fff97
Added to database: 07/02/2026, 23:21:35 UTC
Last enriched: 07/02/2026, 23:37:50 UTC
Last updated: 07/03/2026, 02:18:19 UTC
Views: 5
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