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Atsama5D21C Cu Firmware CVE-2020-12787

HIGH
2020-09-14 cve@mitre.org
Authentication Bypass Atsama5D21C Cu Firmware Atsama5D21C Cur Firmware Atsama5D22C Cn Firmware Atsama5D22C Cnr Firmware Atsama5D22C Cu Firmware Atsama5D22C Cur Firmware Atsama5D23C Cn Firmware Atsama5D23C Cnr Firmware Atsama5D23C Cu Firmware Atsama5D23C Cur Firmware Atsama5D24C Cu Firmware Atsama5D24C Cuf Firmware Atsama5D24C Cur Firmware Atsama5D26C Cn Firmware Atsama5D26C Cnr Firmware Atsama5D26C Cu Firmware Atsama5D26C Cur Firmware Atsama5D27C Cn Firmware Atsama5D27C Cnr Firmware Atsama5D27C Cu Firmware Atsama5D27C Cur Firmware Atsama5D28C Cn Firmware Atsama5D28C Cnr Firmware Atsama5D28C Cu Firmware Atsama5D28C Cur Firmware Atsama5D27C Cnvao Firmware Atsama5D27C Cnrvao Firmware Atsama5D225C D1M Cur Firmware Atsama5D27C D5M Cu Firmware Atsama5D27C D5M Cur Firmware Atsama5D27C D1G Cu Firmware Atsama5D27C D1G Cur Firmware Atsama5D28C D1G Cu Firmware Atsama5D28C D1G Cur Firmware Atsama5D27C Ld1G Cu Firmware Atsama5D27C Ld1G Cur Firmware Atsama5D27C Ld2G Cu Firmware Atsama5D27C Ld2G Cur Firmware Atsama5D28C Ld1G Cu Firmware Atsama5D28C Ld1G Cur Firmware Atsama5D28C Ld2G Cu Firmware Atsama5D28C Ld2G Cur Firmware Atsama5D27 Wlsom1 Firmware Atsama5D27 Som1 Firmware Atsama5D31A Cu Firmware Atsama5D31A Cur Firmware Atsama5D31A Cfu Firmware Atsama5D31A Cfur Firmware Atsama5D33A Cu Firmware Atsama5D33A Cur Firmware Atsama5D34A Cu Firmware Atsama5D34A Cur Firmware Atsama5D35A Cu Firmware Atsama5D35A Cur Firmware Atsama5D35A Cn Firmware Atsama5D35A Cnr Firmware Atsama5D36A Cu Firmware Atsama5D36A Cur Firmware Atsama5D36A Cn Firmware Atsama5D36A Cnr Firmware Atsama5D41A Cu Firmware Atsama5D41A Cur Firmware Atsama5D41B Cu Firmware Atsama5D41B Cur Firmware Atsama5D42A Cu Firmware Atsama5D42A Cur Firmware Atsama5D42B Cu Firmware Atsama5D42B Cur Firmware Atsama5D43A Cu Firmware Atsama5D43A Cur Firmware Atsama5D43B Cu Firmware Atsama5D43B Cur Firmware Atsama5D44A Cu Firmware Atsama5D44A Cur Firmware Atsama5D44B Cu Firmware Atsama5D44B Cur Firmware Microchip
7.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 1.2% exploitation probability (EPSS)

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AnalysisAI

Microchip Atmel ATSAMA5 products in Secure Mode allow an attacker to bypass existing security mechanisms related to applet handling. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

Microchip Atmel ATSAMA5 products in Secure Mode allow an attacker to bypass existing security mechanisms related to applet handling. Affected products include: Microchip Atsama5D21C-Cu Firmware, Microchip Atsama5D21C-Cur Firmware, Microchip Atsama5D22C-Cn Firmware, Microchip Atsama5D22C-Cnr Firmware, Microchip Atsama5D22C-Cu Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

DescriptionNVD

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

Threat Intelligence Overview

EPSS Score
1.2%
Top 35% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 1.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

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:-:*:*:*:*:*:*:*
+ 56 more

More in Atsama5D21C Cu Firmware

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CVE-2020-12789 HIGH
7.5 Sep 14

The Secure Monitor in Microchip Atmel ATSAMA5 products use a hardcoded key to encrypt and authenticate secure applets. R
CVE-2020-12788 HIGH
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CMAC verification functionality in Microchip Atmel ATSAMA5 products is vulnerable to vulnerable to timing and power anal

Same technique Authentication Bypass

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References

Advisories & patches
REF https://labs.f-secure.com/advisories/microchip-atsama5-soc-multiple-vulnerabilities/

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