How severe is CVE-2020-11683?

CVE-2020-11683 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-11683 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11683?

CVE-2020-11683 affects Linux4sam At91bootstrap. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11683?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-11683 published?

CVE-2020-11683 was published on 2020-09-14 and last updated on 2026-06-17.

CVE-2020-11683

CVE-2020-11683 is a medium-severity vulnerability in Linux4sam At91bootstrap with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.6
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Linux4sam At91bootstrap
Published: 2020-09-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-11683?: 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.
How severe is CVE-2020-11683?: CVE-2020-11683 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-11683 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11683?: CVE-2020-11683 affects Linux4sam At91bootstrap. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11683?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-11683 published?: CVE-2020-11683 was published on 2020-09-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linux4sam:at91bootstrap:*:*:*:*:*:*:*:*

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