CVE-2021-2432Network attack vector

Unauthenticated denial of service through JNDI

Published Jul 20, 2021 · Updated Sep 25, 2024

Denial of service in Oracle Java SE 7u301 JNDI allows remote attackers to partially interrupt the runtime through multiple protocols. Oracle has not disclosed the specific JNDI method or input-processing error that produces the availability loss. Exploitation requires a deployment that runs untrusted sandboxed code or exposes JNDI APIs to attacker-controlled data, and the reported consequence is limited to partial service interruption.

CVSS severity3.7
Low
EPSS probability3.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle Java SE 7u301 JNDI allows remote attackers to partially interrupt the runtime through multiple protocols. Oracle has not disclosed the specific JNDI method or input-processing error that produces the availability loss. Exploitation requires a deployment that runs untrusted sandboxed code or exposes JNDI APIs to attacker-controlled data, and the reported consequence is limited to partial service interruption.

The record

CVE
CVE-2021-2432
Published
Jul 20, 2021
Updated
Sep 25, 2024
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
T1499
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=Java SE:7u301

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE:7u301

Published CVSS scores

3.7Oracle CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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