CVE-2023-6247Network attack vector

Application crash via malformed PKCS#7 signature

Published Feb 20, 2024 · Updated Oct 28, 2024

NULL pointer dereference in OpenVPN 3 Core Library 3.0 through 3.8.3 allows remote authenticated users to crash embedding applications. OpenSSLSign::verify_pkcs7 failed to reject a null result from PEM_read_bio_PKCS7 before detached-signature handling dereferenced it. The affected path processes malformed PKCS#7 signatures for AWS integration, not the OpenVPN protocol, and interrupts only the embedding application.

CVSS severity6.5
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in OpenVPN 3 Core Library 3.0 through 3.8.3 allows remote authenticated users to crash embedding applications. OpenSSLSign::verify_pkcs7 failed to reject a null result from PEM_read_bio_PKCS7 before detached-signature handling dereferenced it. The affected path processes malformed PKCS#7 signatures for AWS integration, not the OpenVPN protocol, and interrupts only the embedding application.

The record

CVE
CVE-2023-6247
Published
Feb 20, 2024
Updated
Oct 28, 2024
Vendor
OpenVPN Inc.
Product
OpenVPN 3 Core Library
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=3.0 <=3.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenVPN Inc. · OpenVPN 3 Core Libraryversion=3.0 <=3.8.3

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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