CVE-2022-21293Network attack vector

Denial of service via incomplete deserialization checks

Published Jan 19, 2022 · Updated May 27, 2026

Denial of service in Oracle Java SE Libraries in 7u321, 8u311, 11.0.13, and 17.0.1 allows remote attackers to interrupt service. The StringBuffer and StringBuilder deserialization logic fails to validate the serialized count value, allowing inconsistent object state. Exposure requires untrusted serialized input through sandboxed code or an application API, and successful exploitation disrupts availability without reported data access or modification.

CVSS severity5.3
Medium
EPSS probability8.35%
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 Libraries in 7u321, 8u311, 11.0.13, and 17.0.1 allows remote attackers to interrupt service. The StringBuffer and StringBuilder deserialization logic fails to validate the serialized count value, allowing inconsistent object state. Exposure requires untrusted serialized input through sandboxed code or an application API, and successful exploitation disrupts availability without reported data access or modification.

The record

CVE
CVE-2022-21293
Published
Jan 19, 2022
Updated
May 27, 2026
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 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:20.3.4
  2. Affected versionversion=Oracle GraalVM Enterprise Edition:21.3.0
  3. Affected versionversion=Oracle Java SE:11.0.13
  4. Affected versionversion=Oracle Java SE:17.0.1
  5. Affected versionversion=Oracle Java SE:7u321
  6. Affected versionversion=Oracle Java SE:8u311

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:20.3.4; version=Oracle GraalVM Enterprise Edition:21.3.0; version=Oracle Java SE:11.0.13; version=Oracle Java SE:17.0.1; version=Oracle Java SE:7u321; version=Oracle Java SE:8u311

Published CVSS scores

5.3Oracle CorporationCVSS:3.1/AV:N/AC:L/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.

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

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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