CVE-2021-2456Network attack vector

Unauthenticated code execution via unsafe servlet deserialization

Published Jul 20, 2021 · Updated Sep 25, 2024

Deserialization in Oracle Business Intelligence Enterprise Edition 12.2.1.4.0 allows remote attackers to execute code via HTTP. BIRemotingServlet fails to properly validate user-supplied data before deserializing it, enabling arbitrary code execution. No authentication or user interaction is required, and execution in the Administrator context enables complete application takeover.

CVSS severity9.8
Critical
EPSS probability81.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Oracle Business Intelligence Enterprise Edition 12.2.1.4.0 allows remote attackers to execute code via HTTP. BIRemotingServlet fails to properly validate user-supplied data before deserializing it, enabling arbitrary code execution. No authentication or user interaction is required, and execution in the Administrator context enables complete application takeover.

The record

CVE
CVE-2021-2456
Published
Jul 20, 2021
Updated
Sep 25, 2024
Vendor
Oracle
Product
Oracle Business Intelligence Enterprise Edition
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=12.2.1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Oracle Business Intelligence Enterprise Editionversion=12.2.1.4.0

Published CVSS scores

9.8OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NISTAV:N/AC:L/Au:N/C:P/I:P/A:P

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

T1190Exploit Public-Facing Application

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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