CVE-2020-12789

CVE-2020-12789 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-798.

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
• Weakness: CWE-798
• Affected product: Microchip Atsama5d21c-cu Firmware
• Published: 2020-09-14
• Last modified: 2026-06-17

Description

The Secure Monitor in Microchip Atmel ATSAMA5 products use a hardcoded key to encrypt and authenticate secure applets.

Frequently asked questions

What is CVE-2020-12789?

The Secure Monitor in Microchip Atmel ATSAMA5 products use a hardcoded key to encrypt and authenticate secure applets.

How severe is CVE-2020-12789?

CVE-2020-12789 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-2020-12789 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-2020-12789?

CVE-2020-12789 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-2020-12789?

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-2020-12789 published?

CVE-2020-12789 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:-:*:*:*:*:*:*:*

More vulnerabilities in Microchip Atsama5d21c-cu Firmware

• CVE-2020-12788 — High (CVSS 7.5): CMAC verification functionality in Microchip Atmel ATSAMA5 products is vulnerable to vulnerable to timing and power…
• CVE-2020-12787 — High (CVSS 7.5): Microchip Atmel ATSAMA5 products in Secure Mode allow an attacker to bypass existing security mechanisms related to…

All CVEs affecting Microchip Atsama5d21c-cu Firmware →

Other CWE-798 (Use of Hard-coded Credentials) vulnerabilities

• CVE-2026-13768 — Critical (CVSS 10.0): Gardyn devices expose a privileged iothubowner key. Access to this key will allow a malicious user to invoke an IoTHub…
• CVE-2026-45631 — Critical (CVSS 10.0): Dokploy is a free, self-hostable Platform as a Service (PaaS). From 0.27.0 to before 0.29.3, a hardcoded…
• CVE-2026-22769 — Critical (CVSS 10.0): Dell RecoverPoint for Virtual Machines, versions prior to 6.0.3.1 HF1, contain a hardcoded credential vulnerability.…
• CVE-2025-42890 — Critical (CVSS 10.0): SQL Anywhere Monitor (Non-GUI) baked credentials into the code,exposing the resources or functionality to unintended…
• CVE-2025-7503 — Critical (CVSS 10.0): An OEM IP camera manufactured by Shenzhen Liandian Communication Technology LTD exposes a Telnet service (port 23) with…
• CVE-2025-20309 — Critical (CVSS 10.0): A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session…

Browse all CWE-798 (Use of Hard-coded Credentials) vulnerabilities →