What’s Vulnerable › Vulnerabilities

CVE-2021-3391

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-29 · updated 2026-06-17

Description

MobileIron Mobile@Work through 2021-03-22 allows attackers to distinguish among valid, disabled, and nonexistent user accounts by observing the number of failed login attempts needed to produce a Lockout error message

Affected products

• Mobileiron Mobile@Work: through 11.0.0.0.115r; through 12.11.1

References

• https://github.com/optiv/rustyIron
• https://www.mobileiron.com/en/blog/mobileiron-security-updates-available
• https://www.optiv.com/explore-optiv-insights/source-zero/mobileiron-mdm-contains-static-key-allowing-account-enumeration
• https://github.com/optiv/rustyIron
• https://www.mobileiron.com/en/blog/mobileiron-security-updates-available
• https://www.optiv.com/explore-optiv-insights/source-zero/mobileiron-mdm-contains-static-key-allowing-account-enumeration

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