CVE-2021-2341Network attack vector

Sandboxed data disclosure to remote attackers

Published Jul 20, 2021 · Updated Sep 26, 2024

Information disclosure in Oracle Java SE 7u301, 8u291, 11.0.11, and 16.0.1 allows remote attackers to read a subset of accessible data. Oracle identifies the Networking component but has not published the flawed operation or how attacker-controlled input crosses the Java sandbox boundary. Exploitation requires a user to load and run untrusted code in a sandboxed client deployment; servers that run only trusted administrator-installed code are not affected.

CVSS severity3.1
Low
EPSS probability4.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Oracle Java SE 7u301, 8u291, 11.0.11, and 16.0.1 allows remote attackers to read a subset of accessible data. Oracle identifies the Networking component but has not published the flawed operation or how attacker-controlled input crosses the Java sandbox boundary. Exploitation requires a user to load and run untrusted code in a sandboxed client deployment; servers that run only trusted administrator-installed code are not affected.

The record

CVE
CVE-2021-2341
Published
Jul 20, 2021
Updated
Sep 26, 2024
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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:11.0.11
  2. Affected versionversion=Java SE:16.0.1
  3. Affected versionversion=Java SE:7u301
  4. Affected versionversion=Java SE:8u291
  5. Affected versionversion=Oracle GraalVM Enterprise Edition:20.3.2
  6. Affected versionversion=Oracle GraalVM Enterprise Edition:21.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE:11.0.11; version=Java SE:16.0.1; version=Java SE:7u301; version=Java SE:8u291; version=Oracle GraalVM Enterprise Edition:20.3.2; version=Oracle GraalVM Enterprise Edition:21.1.0

Published CVSS scores

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

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

T1204User Execution

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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