CVE-2024-6156Public exploit

API authentication bypass via trusted non-CA certificate

Published Dec 5, 2024 · Updated Mar 18, 2025

Authentication bypass in Canonical LXD allows local users to access affected PKI-mode servers with a trusted client certificate. The TLS listener leaves tls.Config ClientAuth at RequestClientCert, and authentication accepts a trust-store certificate without enforcing the configured CA chain. Exploitation requires PKI mode, a certificate already in the trust store, and a client that sends it despite the server's advertised CA list.

CVSS severity3.8
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Canonical LXD allows local users to access affected PKI-mode servers with a trusted client certificate. The TLS listener leaves tls.Config ClientAuth at RequestClientCert, and authentication accepts a trust-store certificate without enforcing the configured CA chain. Exploitation requires PKI mode, a certificate already in the trust store, and a client that sends it despite the server's advertised CA list.

The record

CVE
CVE-2024-6156
Published
Dec 5, 2024
Updated
Mar 18, 2025
Vendor
Canonical
Product
LXD
Classifications
CWE-295, T1078
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2025Record 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 <5.21.2
  2. Affected versionversion=4.0 <4.0.10
  3. Affected versionversion=4.0 <5.0.4
  4. Affected versionversion=4.0 <5.21.2
  5. Affected versionversion=4.0 <6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Canonical · LXDversion=0 <5.21.2; version=4.0 <4.0.10; version=4.0 <5.0.4; version=4.0 <5.21.2; version=4.0 <6.1

Published CVSS scores

3.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1078Valid Accounts

Public exploit references

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

Technologies

Your stack

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Your stack

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