CVE Intelligence
High Memory corruption

CVE-2023-0286 — X.400 address type confusion in X.509 GeneralName

There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.

Published Feb 8, 2023 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: openssl

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 62% (30-day exploitation probability)+15
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
61.98%
ahead of 99% of scored CVEs · Oct 14, 2026
Affects
Openssl
Openssl and 4 more
CVSS base
7.4
High · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — git.openssl.org (NIST National Vulnerability Database)
  • Documented patch — git.openssl.org (NIST National Vulnerability Database)
  • Documented patch — git.openssl.org (NIST National Vulnerability Database)
  • Rust Openssl-src: fixed in version 111.25.0 — github.com (GitHub Security Advisories)
  • Rust Openssl-src: fixed in version 300.0.12 — github.com (GitHub Security Advisories)
  • Pip Cryptography: fixed in version 39.0.1 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Openssl Openssl, StormShield Stormshield Management Center, StormShield StormShield Network Security…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. Apply the fixed version or the patch documented under Remediation.
  4. EPSS ahead of 99% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Openssl Openssl ≥ 1.0.2 and < 1.0.2zg≥ 1.1.1 and < 1.1.1t≥ 3.0.0 and < 3.0.8 Vulnerable NIST National Vulnerability Database
Openssl Openssl ≥ 3.0.0 and < 3.0.8≥ 1.1.1 and < 1.1.1t≥ 1.0.2 and < 1.0.2zg Vulnerable CVE Program (cve.org) e CISA ADP
StormShield Stormshield Management Center < 3.3.3 Vulnerable NIST National Vulnerability Database
StormShield StormShield Network Security ≥ 2.7.0 and < 2.7.11≥ 2.8.0 and < 3.7.34≥ 3.8.0 and < 3.11.22≥ 4.0.0 and < 4.3.16≥ 4.4.0 and < 4.6.3 Vulnerable NIST National Vulnerability Database
Pip Cryptography ≥ 0.8.1 and < 39.0.1 Vulnerable GitHub Security Advisories
Rust Openssl-src < 111.25.0≥ 300.0.0 and < 300.0.12 Vulnerable GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
7.4 CVSS 3.1 High 2.2 5.2 nvd@nist.gov via NIST National Vulnerability Database
7.4 CVSS 3.1 High 2.2 5.2 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
7.4 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
7.4 CVSS 3.1 High — — CISA-ADP via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-843 · Type Confusion

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • Fix documented
    Oct 14, 2026 · GitHub Security Advisories
  • Affected products added · pip/cryptography, rust/openssl-src
    Oct 14, 2026 · GitHub Security Advisories
  • Affected products added · openssl/openssl
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 14, 2026
  • Fix documented
    Oct 14, 2026 · NIST National Vulnerability Database
  • Affected products added · openssl/openssl, stormshield/stormshield management center, stormshield/stormshield network security
    Oct 14, 2026 · NIST National Vulnerability Database
  • CVSS changed · 7.4
    Oct 14, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 14, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 14, 2026 · Alertas do Telegram
  • 2023
  • CVE published
    Feb 8, 2023 · openssl

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 14, 2026 – Oct 14, 2026
  • 1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

26 on the record

Elsewhere on this site

Openssl
every CVE for this vendor
Memory corruption
same class
CWE-843
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-84784 QUIC: Unbounded RETIRE_CONNECTION_ID Backlog 16d
  • CVE-2026-84783 Use-After-Free in X.509 Extension Cache Under Concurrent Use 16d
  • CVE-2026-84782 DTLS Retransmits Handshake Messages From a Stale Buffer Offset 16d
  • CVE-2026-77696 Timing Side-Channel in SM2 Signature Generation 16d
  • CVE-2026-75806 Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes DoS 16d
  • CVE-2026-75805 NULL Pointer Dereference in CMP Client Revocation Response Handling 16d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-0286 is "X.400 address type confusion in X.509 GeneralName", rated High. It affects Openssl (Openssl); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.4 describes technical severity. EPSS 61.98% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.

Sign in or create an account to comment and suggest corrections.