CVE-2022-1319Network attack vector

Denial of service via reusable double AJP response

Published Aug 31, 2022 · Updated Aug 3, 2024

Unchecked response handling in Red Hat Undertow allows remote attackers to interrupt AJP service after an HTTP 400 response. AjpReadListener.handleEvent emits an extra bad-request response and marks END_RESPONSE reusable even though it closes the connection. An exposed AJP listener is required; subsequent CPING reuse consumes the stale SEND_HEADERS packet instead of CPONG, disrupting service.

CVSS severity7.5
High
EPSS probability1.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unchecked response handling in Red Hat Undertow allows remote attackers to interrupt AJP service after an HTTP 400 response. AjpReadListener.handleEvent emits an extra bad-request response and marks END_RESPONSE reusable even though it closes the connection. An exposed AJP listener is required; subsequent CPING reuse consumes the stale SEND_HEADERS packet instead of CPONG, disrupting service.

The record

CVE
CVE-2022-1319
Published
Aug 31, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Undertow
Classifications
CWE-252, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 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 2.3.0.Final, 2.2.18.Final, 2.2.17.SP3, 2.2.17.SP4, 2.3.0.Alpha2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Undertowversion=Fixed in 2.3.0.Final, 2.2.18.Final, 2.2.17.SP3, 2.2.17.SP4, 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
7.5Red HatCVSS: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.

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-252Unchecked Return Value
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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