# CVE-2025-12131: Silicon Labs 802.15.4 stack denial of service via truncated packet

Source: https://junglewise.ai/threats/cve-2025-12131-silicon-labs-802-15-4-stack-denial-of-service-via-truncated  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-05. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2025-12131 · Severity: medium · CVSS 6.5 · Published 2026-02-05

Silicon Labs' 802.15.4 wireless networking stack processes packets used in IoT and industrial applications. A malformed truncated packet can trigger an assertion failure in the stack, crashing the affected device or service and causing a temporary denial of service. This vulnerability could disrupt wireless communication in networks relying on 802.15.4 connectivity.

Vendors: [Silicon Labs](https://junglewise.ai/threats/vendors/silicon-labs).

## Quick answers

**Is CVE-2025-12131 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-12131 being exploited in the wild.

**How severe is CVE-2025-12131?** Medium severity, with a CVSS score of 6.5, published 5 February 2026.

**Which products and versions are affected?** Silicon Labs 802.15.4 Stack.

**Is there a fix for CVE-2025-12131?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-12131 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-12131?** Check whether you run Silabs Simplicity Software Development Kit or Silicon Labs 802.15.4 Stack. 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

The vulnerability is an assertion failure triggered by processing a truncated 802.15.4 frame. The affected component does not properly validate packet length before dereferencing packet data, causing an assert when encountering a malformed frame below the minimum expected size. An attacker with network access to the 802.15.4 network can send a crafted truncated packet to trigger the assertion. Successful exploitation results in denial of service through application or device crash. Patches addressing the input validation flaw are available from Silicon Labs.

## Affected products

- Silicon Labs 802.15.4 Stack

## Timeline

- 2026-02-05: disclosed

## References

- [https://community.silabs.com/068Vm00000g8dP3](https://community.silabs.com/068Vm00000g8dP3)