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CVE-2026-13371 WatchGuard CVE debrief

A medium-severity vulnerability, CVE-2026-13371, allows an authenticated administrator to trigger a denial-of-service condition in the Fireware Management Web UI. This is achieved by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input. The vulnerability has a CVSS score of 6.9, indicating a medium severity level. Administrators and security teams responsible for Fireware Management Web UI should prioritize this CVE for potential denial-of-service attacks. The vulnerability affects the Fireware Management Web UI, and its exploitation could lead to a denial-of-service condition.

Vendor
WatchGuard
Product
Fireware OS
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-03
Original CVE updated
2026-08-28
Advisory published
2026-07-03
Advisory updated
2026-08-28

Who should care

Administrators and security teams responsible for Fireware Management Web UI should prioritize this CVE for potential denial-of-service attacks. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Technical summary

CVE-2026-13371 is a denial-of-service vulnerability in the Fireware Management Web UI. An authenticated administrator can exploit this by sending crafted data to the put_data endpoint, leading to unsafe deserialization. The CVSS score for this vulnerability is 6.9, indicating a medium severity level. This vulnerability affects the Fireware Management Web UI, and its exploitation could lead to a denial-of-service condition.

Defensive priority

Medium priority for administrators and security teams managing Fireware Management Web UI instances.

Recommended defensive actions

  • Inventory and assess exposure to Fireware Management Web UI
  • Verify and apply vendor patches or updates
  • Implement compensating controls for denial-of-service attacks
  • Monitor for suspicious activity on the Web UI
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-03T00:16:51.013Z and last modified on 2026-07-07T18:16:34.670Z. The NVD entry is currently Awaiting Analysis. This information is crucial for defenders to understand the current state of the vulnerability and plan accordingly. Additionally, administrators should verify the affected scope and severity based on the official advisory or CVE record.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13371 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13371

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13371 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13371

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00014

    5d1c2695-1a31-4499-88ae-e847036fd7e3

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.