Path Traversal in Nero Backitup
CVE-2025-63680
Nero BackItUp in the Nero Productline is vulnerable to a path parsing/UI rendering flaw (CWE-22) that, in combination with Windows ShellExecuteW fallback extension resolution, leads to arbitrary code execution when a user clicks a crafted entry. By creating a trailing-dot folder and placing a same-basename script, Nero BackItUp renders the file as a folder icon and then invokes ShellExecuteW, which executes the script via PATHEXT fallback (.COM/.EXE/.BAT/.CMD). The issue affects recent Nero BackItUp product lines (2019-2025 and earlier) and has been acknowledged by the vendor.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.003 (21.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Nero Backitup
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-63680?
- CVE-2025-63680 is a high-severity vulnerability in Nero Backitup, classified under Path Traversal. CVSS score: 8.6/10. Published 2025-11-14.
- How severe is CVE-2025-63680?
- High severity. CVSS v3 base score is 8.6 out of 10.