CVE-2024-53846Public exploitNetwork attack vector

Mutual TLS role bypass via silent EKU error

Published Dec 5, 2024 · Updated Dec 6, 2024

Improper certificate validation in Erlang/OTP allows remote authenticated users to bypass mutual TLS role restrictions with a trusted certificate. The ssl application's certificate-purpose check turns an incorrect extended-key-usage result into a silent error, so a server certificate can pass for client authentication and vice versa. Exploitation requires a mutual TLS deployment, the opposite role's trusted certificate and private key, and no verify_fun callback that rejects the unknown-purpose result.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Erlang/OTP allows remote authenticated users to bypass mutual TLS role restrictions with a trusted certificate. The ssl application's certificate-purpose check turns an incorrect extended-key-usage result into a silent error, so a server certificate can pass for client authentication and vice versa. Exploitation requires a mutual TLS deployment, the opposite role's trusted certificate and private key, and no verify_fun callback that rejects the unknown-purpose result.

The record

CVE
CVE-2024-53846
Published
Dec 5, 2024
Updated
Dec 6, 2024
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-295
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=25.3.2.8
  2. Affected versionversion=>= 25.3.2.8, <= 25.3.2.16
  3. Affected versionversion=>= 26.2, <= 26.2.5.6
  4. Affected versionversion=>= 27.0, <= 27.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Erlang · Erlang/OTPversion=0 <=25.3.2.8; version=>= 25.3.2.8, <= 25.3.2.16; version=>= 26.2, <= 26.2.5.6; version=>= 27.0, <= 27.1.3

Published CVSS scores

5.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation

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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