Critical
Security advisory
AT91bootstrap before 3.9.2 does not properly wipe encryption and authentication keys from memory before passing control to a less privileged software component. This can be exploited to disclose these keys and subsequently encrypt and sign the next boot stage (such as the bootloader).
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-11684
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:32 UTC · Revision 1
Source evidence
AT91bootstrap before 3.9.2 does not properly wipe encryption and authentication keys from memory before passing control to a less privileged software component. This can be exploited to disclose these keys and subsequently encrypt and sign the next boot stage (such as the bootloader).
osv:CVE-2020-11684
Complete source record
{
"id": "d7cd66132f92104a0baff2d9ee6cf2e3ed5f3d81b27f10179137f977901ec81c",
"url": "https://osv.dev/vulnerability/CVE-2020-11684",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-11684",
"summary": "AT91bootstrap before 3.9.2 does not properly wipe encryption and authentication keys from memory before passing control to a less privileged software component. This can be exploited to disclose these keys and subsequently encrypt and sign the next boot stage (such as the bootloader).",
"evidence": "osv:CVE-2020-11684",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2020-11684",
"aliases": [
"CVE-2020-11684"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/linux4sam/at91bootstrap",
"type": "GIT",
"events": [
{
"introduced": "533f4082e35869ab61d1112f518063aa0496febb"
},
{
"fixed": "959a75951a8a8feddef210470cb9aca2c9bdcb5a"
},
{
"fixed": "45419497309ffbf27c17ea7938499aca99168927"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:linux4sam:at91bootstrap:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.7.2"
},
{
"fixed": "3.9.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "45419497309ffbf27c17ea7938499aca99168927"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v3.9.1",
"v3.9.1-rc1",
"v3.9.0",
"v3.9.0-rc5",
"v3.9.0-rc4",
"v3.9.0-rc3",
"v3.9.0-rc2",
"v3.9.0-rc1",
"v3.8.13",
"v3.8.13-rc5",
"v3.8.13-rc4",
"v3.8.13-rc3",
"v3.8.13-rc2",
"v3.8.13-rc1",
"v3.8.12",
"v3.8.11",
"v3.8.11-rc4",
"v3.8.11-rc3",
"v3.8.11-rc1",
"v3.8.11-rc2",
"v3.8.10",
"v3.8.10-rc1",
"v3.8.9",
"v3.8.9-rc7",
"v3.8.9-rc6",
"v3.8.9-rc4",
"v3.8.9-rc3",
"v3.8.9-rc2",
"v3.8.9-rc1",
"v3.8.8",
"v3.8.8-rc3",
"v3.8.8-rc2",
"linux4sam_5.6-rc1",
"v3.8.7",
"v3.8.6",
"v3.8.5",
"v3.8.4",
"v3.8.3",
"v3.8.2",
"v3.8.1",
"v3.8",
"v3.8-beta1",
"v3.8-alpha7",
"v3.8-alpha6",
"v3.8-alpha5",
"v3.8-alpha4",
"v3.8-alpha3",
"v3.8-alpha2",
"v3.8-alpha1",
"v3.7.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11684.json",
"vanir_signatures": [
{
"id": "CVE-2020-11684-0473e789",
"digest": {
"length": 1345,
"function_hash": "200692050760140054223115041198207933150"
},
"source": "https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"target": {
"file": "driver/secure.c",
"function": "init_keys"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-11684-103ffd55",
"digest": {
"length": 826,
"function_hash": "153428154091827794769738504096631208817"
},
"source": "https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"target": {
"file": "driver/secure.c",
"function": "secure_decrypt"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-11684-196a3d52",
"digest": {
"threshold": 0.9,
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},
"source": "https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"target": {
"file": "driver/secure.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2020-11684-1bd95be5",
"digest": {
"threshold": 0.9,
"line_hashes": [
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},
"source": "https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"target": {
"file": "include/secure.h"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2020-11684-4c0e5d6d",
"digest": {
"length": 321,
"function_hash": "244496785881977350995589051485898840438"
},
"source": "https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"target": {
"file": "driver/secure.c",
"function": "secure_check"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:46:37Z"
}
}
],
"modified": "2026-10-20T13:46:37.697880260Z",
"provider": "osv",
"references": [
"https://github.com/linux4sam/at91bootstrap/commit/45419497309ffbf27c17ea7938499aca99168927",
"https://labs.f-secure.com/advisories/microchip-at91bootstrap/"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-11684",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388228,
"published_at": "2020-09-14T14:15:10.68+00:00"
}