How severe is CVE-2020-12787?

CVE-2020-12787 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 none, integrity high, and availability none.

Is CVE-2020-12787 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12787?

CVE-2020-12787 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-2020-12787?

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-2020-12787 published?

CVE-2020-12787 was published on 2020-09-14 and last updated on 2026-06-17.

CVE-2020-12787

CVE-2020-12787 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microchip Atsama5d21c-cu Firmware
Published: 2020-09-14
Last modified: 2026-06-17

Description

Microchip Atmel ATSAMA5 products in Secure Mode allow an attacker to bypass existing security mechanisms related to applet handling.

Frequently asked questions

What is CVE-2020-12787?: Microchip Atmel ATSAMA5 products in Secure Mode allow an attacker to bypass existing security mechanisms related to applet handling.
How severe is CVE-2020-12787?: CVE-2020-12787 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 none, integrity high, and availability none.
Is CVE-2020-12787 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12787?: CVE-2020-12787 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-2020-12787?: 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-2020-12787 published?: CVE-2020-12787 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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CVE-2020-12789 — High (CVSS 7.5): The Secure Monitor in Microchip Atmel ATSAMA5 products use a hardcoded key to encrypt and authenticate secure applets.
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