BaseFortify

Publication date: 2025-11-14

Last updated on: 2026-06-01

Assigner: MITRE

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-11-14

Last Modified

2026-06-01

Generated

2026-07-06

AI Q&A

2025-11-14

EPSS Evaluated

2026-07-05

NVD

CVE-2025-63680

EUVD

EUVD-2025-197651

Affected Vendors & Products

Vendor	Product	Version / Range
nero	backitup	2019
nero	backitup	2022
nero	backitup	2020
nero	backitup	2021
nero	backitup	2023
nero	backitup	2025
nero	backitup	2024

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Impact Analysis

This vulnerability can lead to arbitrary code execution on the affected system when a user clicks a crafted entry in Nero BackItUp. This means an attacker could run malicious code with the user's privileges, potentially compromising the system, stealing data, or causing other harm.

Executive Summary

This vulnerability in Nero BackItUp involves a path parsing and UI rendering flaw (CWE-22) that, combined with Windows ShellExecuteW fallback extension resolution, allows arbitrary code execution. An attacker can create a folder with a trailing dot and place a script with the same basename inside it. Nero BackItUp then displays the script as a folder icon and when the user clicks it, ShellExecuteW executes the script via fallback extensions like .COM, .EXE, .BAT, or .CMD, leading to code execution.

Hi! I’m here to help you understand CVE-2025-63680. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70