CVE-2023-21838Network attack vector

Denial of service via crafted IIOP deserialization

Published Jan 17, 2023 · Updated Sep 17, 2024

Untrusted-data deserialization in Oracle WebLogic Server Core 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0 allows remote attackers to hang or crash servers. The IIOP message handler deserializes attacker-crafted protocol data, triggering the denial-of-service condition. No authentication is required, and the documented consequence is limited to a server hang or repeatable crash.

CVSS severity7.5
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Untrusted-data deserialization in Oracle WebLogic Server Core 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0 allows remote attackers to hang or crash servers. The IIOP message handler deserializes attacker-crafted protocol data, triggering the denial-of-service condition. No authentication is required, and the documented consequence is limited to a server hang or repeatable crash.

The record

CVE
CVE-2023-21838
Published
Jan 17, 2023
Updated
Sep 17, 2024
Vendor
Oracle Corporation
Product
Oracle WebLogic Server
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=12.2.1.3.0
  2. Affected versionversion=12.2.1.4.0
  3. Affected versionversion=14.1.1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Oracle WebLogic Serverversion=12.2.1.3.0; version=12.2.1.4.0; version=14.1.1.0.0

Published CVSS scores

7.5OracleCVSS:3.1/AV:N/AC:L/PR:N/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.

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-400Uncontrolled Resource Consumption
T1499.004Application 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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