{"id":"CVE-2025-12899","title":"A flaw in Zephyr’s network stack allows an IPv4 packet containing ICMP type 128 to be misclassified as an ICMPv6 Echo Request","summary":"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 net…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cwe":["CWE-843"],"published":"2026-01-30","updated":"2026-10-13","sourceUpdated":"2026-10-13T20:17:00.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-12899","references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c2vg-hj83-c2vg","label":"vulnerabilities@zephyrproject.org"}],"tags":["nvd"],"epss":0.00339,"epssPercentile":0.25505,"ingestedAt":"2026-10-13T20:53:44.536Z","slug":"CVE-2025-12899","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}