Use After Free in Apache Nuttx
CVE-2025-48769
Use After Free vulnerability was discovered in fs/vfs/fs_rename code of the Apache NuttX RTOS, that due recursive implementation and single buffer use by two different pointer variables allowed arbitrary user provided size buffer reallocation and write to the previously freed heap chunk, that in specific cases could cause unintended virtual filesystem rename/move operation results. This issue affects Apache NuttX RTOS: from 7.20 before 12.11.0. Users of virtual filesystem based services with write access especially when exposed over the network (i.e. FTP) are affected and recommended to upgrade to version 12.11.0 that fixes the issue.
Vulnerability class: Use-After-Free
EPSS: 0.015 (71.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Apache Nuttx
- Apache Software Foundation Nuttx Rtos — versions 7.20
Weakness classification (CWE)
References
- security@apache.org (patch, Issue Tracking)
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-48769?
- CVE-2025-48769 is a high-severity vulnerability in Apache Nuttx, classified under Use After Free. CVSS score: 8.1/10. Published 2026-01-01.
- How severe is CVE-2025-48769?
- High severity. CVSS v3 base score is 8.1 out of 10.