CVE-2023-43637

highpriority · track · 31OT risk · elevatedEPSS 0.001 · 4 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.14% (4th) EPSS

CVSS 7.8 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-28

Due to the implementation of "deriveVaultKey", prior to version 7.10, the generated vault key would always have the last 16 bytes predetermined to be "arfoobarfoobarfo". This issue happens because "deriveVaultKey" calls "retrieveCloudKey" (which will always return "foobarfoobarfoobarfoobarfoobarfo" as the key), and then merges the 32byte randomly generated key with this key (by takeing 16bytes from each, see "mergeKeys"). This makes the key a lot weaker. This issue does not persist in devices that were initialized on/after version 7.10, but devices that were initialized before that and updated to a newer version still have this issue. Roll an update that enforces the full 32bytes key usage.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.7–7.8

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · cve@asrg.ioexploitability 1.1 · impact 6

v3.16.7mediumCVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Nsecondary · OSV

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USprimaryCWE-321USCWE-321USCWE-798US

affected products (3)

Products and version ranges known to be affected.

EVE OS0 → 7.10enisa_euvdEU
lfedge eve< 7.10nvdUScpe:2.3:o:lfedge:eve:*:*:*:*:*:*:*:*
Go github.com/lf-edge/eve< 0.0.0-20220310190112-c0c966dc31e2osvUSpkg:golang/github.com/lf-edge/eve

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-g7vp-j25f-h34pEVE Has Partially Predetermined Vault Key2026-02-04ghsa · osvUS
### Impact The deriveVaultKey function calls retrieveCloudKey which always returns "foobarfoobarfoobarfoobarfoobarfo". When merged with the randomly generated 32-byte key using mergeKeys (16 bytes from each), the last 16 bytes are always "arfoobarfoobarfo". This enables an attacker with physical access to the EVE-OS device to attempt to brute force the remaining 128 bits of key. ### Patches Fixed in 7.10 and 8.12.1-lts ### Workarounds None
GO-2026-4436EVE Has Partially Predetermined Vault Key in github.com/lf-edge/eve2026-02-17vendor · osvUS
EVE Has Partially Predetermined Vault Key in github.com/lf-edge/eve

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2023-09-21modified 2026-06-17

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+2277 more

references (5)

External citations — patches, advisories, analysis.

scry

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