MEDIUM
CVE-2020-11683
CWE-203Published: September 14, 2020· Updated: Jun 17, 2026
6.8
CVSS v3.1
Official 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.
Technical Analysis
CVE-2020-11683 requires local access, meaning attackers must already have a foothold on the target system.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
linux4sam1 product(s)
at91bootstrap
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213Patch · Third Party Advisory
→
https://labs.f-secure.com/advisories/microchip-at91bootstrap/Exploit · Third Party Advisory
→
https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213Patch · Third Party Advisory
→
https://labs.f-secure.com/advisories/microchip-at91bootstrap/Exploit · Third Party Advisory
Quick Facts
CVE IDCVE-2020-11683
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-203
CISA KEVNo
Affected1 vendor(s)
PublishedSep 14, 2020
Related CVEs (CWE-203)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-11683 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.