CVE-2021-39392

CRITICAL

MyLittleBackup <= 1.7 - Remote Code Execution via Hardcoded MachineKey Deserialization

Title source: llm

Description

The management tool in MyLittleBackup up to and including 1.7 allows remote attackers to execute arbitrary code because machineKey is hardcoded (the same for all customers' installations) in web.config, and can be used to send serialized ASP code.

References (2)

Core 2

Core References

Broken Link x_refsource_misc

http://www.mylittlebackup.com/mlb/zip/mlb_1.7.zip

Third Party Advisory x_refsource_misc

https://gist.github.com/omriinbar/65827626e63f15e3e50557e2d9d61281

Scores

CVSS v3 9.8

EPSS 0.0219

EPSS Percentile 80.1%

Attack Vector NETWORK

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

Details

CWE

CWE-502

Status published

Products (1)

mylittletools/mylittlebackup < 1.7

Published Sep 15, 2021

Tracked Since Feb 18, 2026