CVE-2023-43637

Vault-key brute force via hard-coded key half

Published Sep 21, 2023 · Updated Sep 24, 2024

Hard-coded key material in LF Edge EVE-OS before 7.10 allows physically proximate attackers to brute-force device vault keys. deriveVaultKey passes a constant from retrieveCloudKey to mergeKeys, which replaces half of the random 32-byte TPM key with fixed bytes. Exposure requires physical access and low privileges, and persists on devices initialized before 7.10 even after a later upgrade.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Hard-coded key material in LF Edge EVE-OS before 7.10 allows physically proximate attackers to brute-force device vault keys. deriveVaultKey passes a constant from retrieveCloudKey to mergeKeys, which replaces half of the random 32-byte TPM key with fixed bytes. Exposure requires physical access and low privileges, and persists on devices initialized before 7.10 even after a later upgrade.

The record

CVE
CVE-2023-43637
Published
Sep 21, 2023
Updated
Sep 24, 2024
Vendor
Linux Foundation
Product
EVE (Edge Virtualization Engine)
Classifications
CWE-321, CAPEC-115, T1110
Attack vector
physical
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <7.10

What conditions does exploitation require?

Attack vectorphysical
Required privilegesauthenticated

What is affected?

Linux Foundation · EVE (Edge Virtualization Engine)version=0 <7.10
LF Edge · EVE-OSversion=0 <7.10

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Automotive Security Research GroupCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
6.7GitHubCVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-321Use of Hard-coded Cryptographic Key
CAPEC-115Authentication Bypass
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo