CVE-2021-35603Network attack vector

Unauthenticated partial data disclosure through TLS

Published Oct 20, 2021 · Updated Aug 4, 2024

Information disclosure in Oracle Java SE JSSE allows remote attackers to read a subset of accessible data through TLS. Oracle has not published the affected JSSE operation or how crafted TLS input causes the unauthorized read. Exploitation is difficult and requires either untrusted sandboxed Java code or an application, such as a web service, that supplies attacker-controlled data to JSSE APIs.

CVSS severity3.7
Low
EPSS probability4.41%
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 JSSE allows remote attackers to read a subset of accessible data through TLS. Oracle has not published the affected JSSE operation or how crafted TLS input causes the unauthorized read. Exploitation is difficult and requires either untrusted sandboxed Java code or an application, such as a web service, that supplies attacker-controlled data to JSSE APIs.

The record

CVE
CVE-2021-35603
Published
Oct 20, 2021
Updated
Aug 4, 2024
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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:11.0.12
  2. Affected versionversion=Java SE:17
  3. Affected versionversion=Java SE:7u311
  4. Affected versionversion=Java SE:8u301
  5. Affected versionversion=Oracle GraalVM Enterprise Edition:20.3.3
  6. Affected versionversion=Oracle GraalVM Enterprise Edition:21.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE:11.0.12; version=Java SE:17; version=Java SE:7u311; version=Java SE:8u301; version=Oracle GraalVM Enterprise Edition:20.3.3; version=Oracle GraalVM Enterprise Edition:21.2.0

Published CVSS scores

3.7OracleCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/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

No sourced classifications are available.

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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