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CVE-2025-14733 WatchGuard CVE debrief

CVE-2025-14733 is a WatchGuard Firebox out-of-bounds write vulnerability that CISA added to the Known Exploited Vulnerabilities (KEV) catalog on 2025-12-19. The KEV listing means CISA considers the issue to be known exploited, so affected environments should treat it as a high-priority remediation item. The supplied corpus does not include CVSS scoring or deeper technical details beyond the vulnerability class.

Vendor
WatchGuard
Product
Firebox
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-12-19
Original CVE updated
2025-12-19
Advisory published
2025-12-19
Advisory updated
2025-12-19

Who should care

WatchGuard Firebox administrators, security operations teams, incident responders, and anyone responsible for perimeter or internet-facing firewall appliances should prioritize this CVE immediately.

Technical summary

The supplied sources identify CVE-2025-14733 as an out-of-bounds write vulnerability affecting WatchGuard Firebox. CISA’s KEV catalog entry indicates known exploitation, but the corpus does not provide proof-of-concept details, impact specifics, or CVSS metrics. The relevant public sources are the CISA KEV entry, the NVD record, the CVE record, and the vendor advisory referenced by CISA.

Defensive priority

High. A KEV listing indicates known exploitation and warrants prompt action on any affected Firebox deployment, especially internet-accessible systems.

Recommended defensive actions

  • Apply mitigations per WatchGuard’s vendor instructions as soon as possible.
  • If mitigations are unavailable, follow CISA BOD 22-01 guidance for cloud services or discontinue use of the product.
  • Check for signs of potential compromise on all internet-accessible instances after applying mitigations.
  • Review the WatchGuard advisory and NVD record for product-specific remediation guidance and updated details.
  • Inventory all WatchGuard Firebox deployments to confirm exposure and remediation status.

Evidence notes

All statements are based only on the supplied corpus and official links. The source item metadata and CISA KEV entry identify the issue as WatchGuard Firebox Out of Bounds Write Vulnerability, vendorProject WatchGuard, product Firebox, dateAdded 2025-12-19, dueDate 2025-12-26, and knownRansomwareCampaignUse Unknown. No CVSS score, exploit mechanism, or broader impact details were provided in the corpus.

Official resources

Publicly listed by CISA in the KEV catalog on 2025-12-19. The supplied corpus contains only high-level vulnerability identification and remediation guidance, so no exploit details are included here.