CVE-2025-7403

HIGH

Published Sep 19, 2025 Modified Oct 29, 2025 CWE-123

Description

Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption.

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CVSS v3.1 Score

7.6

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Weakness Type (CWE)

CWE-123 CWE-123

Affected Products

Vendor	Product	Versions
zephyrproject	zephyr	< 4.1.0

References

Advisories & Patches

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9r46-cqqw-6j2j

Frequently Asked Questions

What is CVE-2025-7403? +

Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption. It has a CVSS v3.1 base score of 7.6 (HIGH).

How severe is CVE-2025-7403? +

CVE-2025-7403 has a CVSS v3.1 score of 7.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-7403? +

CVE-2025-7403 affects products from zephyrproject, specifically: zephyr. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-7403? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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