CVE-2025-7403

HIGH
2025-09-19 [email protected]
7.6
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 19:13 vuln.today
Patch Released
Mar 28, 2026 - 19:13 nvd
Patch available
CVE Published
Sep 19, 2025 - 06:15 nvd
HIGH 7.6

Tags

Buffer Overflow Zephyr

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.

Analysis

Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. Rated high severity (CVSS 7.6), this vulnerability is no authentication required, low attack complexity.

Technical Context

This vulnerability is classified under CWE-123. 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. Affected products include: Zephyrproject Zephyr.

Affected Products

Zephyrproject Zephyr.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2025-7403 vulnerability details – vuln.today
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