How severe is CVE-2020-12788?

CVE-2020-12788 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-12788 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12788?

CVE-2020-12788 primarily affects Microchip Atsama5d21c-cu Firmware. In total, 76 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-12788?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-12788 published?

CVE-2020-12788 was published on 2020-09-14 and last updated on 2026-06-17.

CVE-2020-12788

CVE-2020-12788 is a high-severity vulnerability in Microchip Atsama5d21c-cu Firmware with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Microchip Atsama5d21c-cu Firmware
Published: 2020-09-14
Last modified: 2026-06-17

Description

CMAC verification functionality in Microchip Atmel ATSAMA5 products is vulnerable to vulnerable to timing and power analysis attacks.

Frequently asked questions

What is CVE-2020-12788?: CMAC verification functionality in Microchip Atmel ATSAMA5 products is vulnerable to vulnerable to timing and power analysis attacks.
How severe is CVE-2020-12788?: CVE-2020-12788 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-12788 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12788?: CVE-2020-12788 primarily affects Microchip Atsama5d21c-cu Firmware. In total, 76 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-12788?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-12788 published?: CVE-2020-12788 was published on 2020-09-14 and last updated on 2026-06-17.

References

https://labs.f-secure.com/advisories/microchip-atsama5-soc-multiple-vulnerabilities/

Affected products (76)

cpe:2.3:o:microchip:atsama5d21c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d21c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d22c-cn_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d22c-cnr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d22c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d22c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d23c-cn_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d23c-cnr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d23c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d23c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d24c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d24c-cuf_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d24c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d26c-cn_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d26c-cnr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d26c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d26c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cn_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cnr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-cn_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-cnr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cnvao_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-cnrvao_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d225c-d1m-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-d5m-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-d5m-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-d1g-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-d1g-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-d1g-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-d1g-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-ld1g-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-ld1g-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-ld2g-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d27c-ld2g-cur_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-ld1g-cu_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:microchip:atsama5d28c-ld1g-cur_firmware:-:*:*:*:*:*:*:*

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