CVE-2021-22096Network attack vector

Insertion of forged log entries

Published Oct 28, 2021 · Updated Aug 3, 2024

Log injection in Spring Framework 5.3.0 through 5.3.10 and 5.2.17 and earlier allows remote attackers to insert forged log entries. Spring has not published the affected component or the operation that fails to neutralize malicious input before logging it. Exploitation requires user interaction; the documented consequence is limited to inserting additional entries into application logs.

CVSS severity5.4
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in Spring Framework 5.3.0 through 5.3.10 and 5.2.17 and earlier allows remote attackers to insert forged log entries. Spring has not published the affected component or the operation that fails to neutralize malicious input before logging it. Exploitation requires user interaction; the documented consequence is limited to inserting additional entries into application logs.

The record

CVE
CVE-2021-22096
Published
Oct 28, 2021
Updated
Aug 3, 2024
Vendor
Spring
Product
Spring Framework
Classifications
CWE-117, T1070
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Spring Framework versions 5.3.x prior to 5.3.12+, 5.2.x prior to 5.2.18+ and all older unsupported versions are impacted.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Frameworkversion=Spring Framework versions 5.3.x prior to 5.3.12+, 5.2.x prior to 5.2.18+ and all older unsupported versions are impacted.

Published CVSS scores

5.4SpringCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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

CWE-117Improper Output Neutralization for Logs
T1070Indicator Removal

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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