What’s Vulnerable › Vulnerabilities

CVE-2021-39392

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-15 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• Mylittletools Mylittlebackup: through 1.7

References

• http://www.mylittlebackup.com/mlb/zip/mlb_1.7.zip
• https://gist.github.com/omriinbar/65827626e63f15e3e50557e2d9d61281
• http://www.mylittlebackup.com/mlb/zip/mlb_1.7.zip
• https://gist.github.com/omriinbar/65827626e63f15e3e50557e2d9d61281

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