CVE-2025-12899 net: icmp: Out of bound memory read
An attacker can trigger an out-of-bounds memory read in the Zephyr network stack by sending a specific IPv4 ICMP packet, potentially leaking sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12899?
CVE-2025-12899 is a medium-severity vulnerability in zephyrproject-rtos Zephyr, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-843
Which versions are affected by CVE-2025-12899?
How do I fix CVE-2025-12899?
No fix has been published for CVE-2025-12899 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-12899 being exploited?
There is no known exploitation of CVE-2025-12899 in the wild and no public exploit code.
Sources
Also known as GHSA-c2vg-hj83-c2vg.