CVE-2023-0286Network attack vector

Memory disclosure or crash via X.400 type confusion

Published Feb 8, 2023 · Updated Nov 4, 2025

Type confusion in X.509 GeneralName processing in OpenSSL allows remote attackers to read memory or crash applications through crafted X.400 addresses. GENERAL_NAME_cmp treats an x400Address parsed as ASN1_STRING as ASN1_TYPE, allowing attacker-controlled pointers to reach memcmp. CRL checking must be enabled, and exploitation generally requires control of both the certificate chain and CRL.

CVSS severity7.4
High
EPSS probability59.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in X.509 GeneralName processing in OpenSSL allows remote attackers to read memory or crash applications through crafted X.400 addresses. GENERAL_NAME_cmp treats an x400Address parsed as ASN1_STRING as ASN1_TYPE, allowing attacker-controlled pointers to reach memcmp. CRL checking must be enabled, and exploitation generally requires control of both the certificate chain and CRL.

The record

CVE
CVE-2023-0286
Published
Feb 8, 2023
Updated
Nov 4, 2025
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
CWE-843, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=1.0.2 <1.0.2zg
  2. Affected versionversion=1.1.1 <1.1.1t
  3. Affected versionversion=3.0.0 <3.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=1.0.2 <1.0.2zg; version=1.1.1 <1.1.1t; version=3.0.0 <3.0.8

Published CVSS scores

7.4GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Application or System Exploitation

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

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Your stack

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