What is CVE-2025-12899?

CVE-2025-12899 is a medium-severity vulnerability in Zephyrproject-Rtos Zephyr, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.5/10. Published 2026-01-30.

How severe is CVE-2025-12899?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Zephyrproject-Rtos Zephyr

CVE-2025-12899

A flaw in Zephyr’s network stack allows an IPv4 packet containing ICMP type 128 to be misclassified as an ICMPv6 Echo Request. This results in an out-of-bounds memory read and creates a potential information-leak vulnerability in the networking subsystem.

EPSS: 0.003 (22.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Zephyrproject-rtos Zephyr

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

vulnerabilities@zephyrproject.org

Frequently asked questions

What is CVE-2025-12899?: CVE-2025-12899 is a medium-severity vulnerability in Zephyrproject-Rtos Zephyr, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.5/10. Published 2026-01-30.
How severe is CVE-2025-12899?: Medium severity. CVSS v3 base score is 6.5 out of 10.