CVE-2022-39399Network attack vector

Data modification via missing HTTP/2 SNI caching

Published Oct 18, 2022 · Updated May 27, 2026

Improper access control in Oracle Java SE 11.0.16.1, 17.0.4.1, and 19 allows remote attackers to modify data via HTTP. The HTTP/2 client connection cache omits server-name indication data when matching pooled connections, allowing a malicious server sharing an IP address to spoof another origin. Exposure requires sandboxed Java Web Start or applet code from an untrusted source; trusted-code server deployments are not affected.

CVSS severity3.7
Low
EPSS probability1.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Oracle Java SE 11.0.16.1, 17.0.4.1, and 19 allows remote attackers to modify data via HTTP. The HTTP/2 client connection cache omits server-name indication data when matching pooled connections, allowing a malicious server sharing an IP address to spoof another origin. Exposure requires sandboxed Java Web Start or applet code from an untrusted source; trusted-code server deployments are not affected.

The record

CVE
CVE-2022-39399
Published
Oct 18, 2022
Updated
May 27, 2026
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
CWE-284, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2022CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record 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=Oracle GraalVM Enterprise Edition:20.3.7
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.3
  3. Affected versionversion=Oracle GraalVM Enterprise Edition:22.2.0
  4. Affected versionversion=Oracle Java SE:11.0.16.1
  5. Affected versionversion=Oracle Java SE:17.0.4.1
  6. Affected versionversion=Oracle Java SE:19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Oracle GraalVM Enterprise Edition:20.3.7; version=Oracle GraalVM Enterprise Edition:21.3.3; version=Oracle GraalVM Enterprise Edition:22.2.0; version=Oracle Java SE:11.0.16.1; version=Oracle Java SE:17.0.4.1; version=Oracle Java SE:19

Published CVSS scores

3.7OracleCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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

CWE-284Improper Access Control
T1203Exploitation for Client 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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