# CVE-2025-1547: WatchGuard Fireware OS stack overflow in certificate request command

Source: https://junglewise.ai/threats/cve-2025-1547-watchguard-fireware-os-stack-overflow-in-certificate-request  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-04. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2025-1547 · Severity: high · CVSS 7.2 · Published 2025-12-04

WatchGuard Fireware OS is the operating system that powers WatchGuard Firebox network security appliances used to protect enterprise networks. An authenticated administrator with privileged access can exploit a stack-based buffer overflow in the certificate request command to execute arbitrary code on the firewall, potentially gaining full control of the device and the networks it protects.

Technologies: [Watchguard Fireware OS](https://junglewise.ai/threats/technologies/fireware-os). Vendors: [Watchguard](https://junglewise.ai/threats/vendors/watchguard).

## Quick answers

**Is CVE-2025-1547 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-1547 being exploited in the wild.

**How severe is CVE-2025-1547?** High severity, with a CVSS score of 7.2, published 4 December 2025.

**Which products and versions are affected?** Watchguard Fireware OS 12.0 through 12.11.3 (Default models); 12.0 through 12.5.12 (T15/T35 models).

**Is there a fix for CVE-2025-1547?** A patch was published on 2025-12-04: Fixes released as Fireware OS 12.11.3 and 12.5.13 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-1547 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2025-1547?** Check whether you run Watchguard Fireware OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a stack-based buffer overflow vulnerability (CWE-121) in the certificate request command processing within WatchGuard Fireware OS. The vulnerability exists in the CLI management interface and requires authentication with privileged administrator credentials. An authenticated attacker can send specially crafted CLI commands to overflow a stack buffer and achieve arbitrary code execution. The vulnerability affects Fireware OS versions 12.0 through 12.11.3 on Default models and 12.0 through 12.5.12 on T15/T35 models; patches are available (12.11.3 and 12.5.13 respectively). This vulnerability does not affect the default network-facing services and requires CLI access, which is typically restricted to administrative networks.

## Affected products

- WatchGuard Fireware OS 12.0 through 12.11.3 (Default models); 12.0 through 12.5.12 (T15/T35 models)

## Timeline

- 2025-12-04: disclosed
- 2025-12-04: patched: Fixes released as Fireware OS 12.11.3 and 12.5.13
- 2026-08-10: other: Advisory updated

## References

- [https://psirt.watchguard.com/CVE-2025-1547](https://psirt.watchguard.com/CVE-2025-1547)
- [https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00013](https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00013)

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