CVE-2022-2053Network attack vector

Service interruption via oversized AJP POST request

Published Aug 5, 2022 · Updated Aug 3, 2024

Denial of service in Red Hat Undertow allows remote attackers to interrupt service with an oversized AJP POST request. AjpServerRequestConduit closes the backend connection without responding when the request exceeds maxEntitySize, causing the proxy to mark the worker as failed. Exposure requires an AJP listener behind a front-end proxy; mod_cluster can return 503 responses for up to 10 seconds, while mod_proxy_balancer normally forces recovery.

CVSS severity7.5
High
EPSS probability1.00%
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 Red Hat Undertow allows remote attackers to interrupt service with an oversized AJP POST request. AjpServerRequestConduit closes the backend connection without responding when the request exceeds maxEntitySize, causing the proxy to mark the worker as failed. Exposure requires an AJP listener behind a front-end proxy; mod_cluster can return 503 responses for up to 10 seconds, while mod_proxy_balancer normally forces recovery.

The record

CVE
CVE-2022-2053
Published
Aug 5, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Undertow
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2022CVE 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=Fixed in Undertow 2.2.19.Final, Undertow 2.3.0.Alpha2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Undertowversion=Fixed in Undertow 2.2.19.Final, Undertow 2.3.0.Alpha2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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