What’s Vulnerable › Vulnerabilities

CVE-2020-11683

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-09-14 · updated 2026-06-17
• Weakness: CWE-203

Description

A timing side channel was discovered in AT91bootstrap before 3.9.2. It can be exploited by attackers with physical access to forge CMAC values and subsequently boot arbitrary code on an affected system.

Affected products

• Linux4Sam At91Bootstrap: from 3.7.2 before 3.9.2 — fixed in 3.9.2

How to fix

Upgrade to a fixed version: Linux4Sam At91Bootstrap 3.9.2. Check the vendor advisory for mitigations.

References

• https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213
• https://labs.f-secure.com/advisories/microchip-at91bootstrap/
• https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213
• https://labs.f-secure.com/advisories/microchip-at91bootstrap/

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