6.5

CVE-2025-12899: zephyrproject-rtos zephyr Type Confusion

CVSS: 6.5v3.1MediumDeferred
Published 30-01-2026Last modified 13-10-2026
Open JSON

Vulnerability summary

CVE-2025-12899 is a medium (CVSS 6.5) Type Confusion vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.34%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-01-2026
    PublishedVulnerability first disclosed.
  2. 13-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

+0.02 pp

From 0.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Zephyrproject-rtos1 product
  • zephyr< 3.7.2 | ≥ 4.0.0, < 4.2.2

1 vendor · 1 product

References

1 links