CVE-2022-2764Network attack vector

Denial of service via unbounded EJB read

Published Sep 1, 2022 · Updated Aug 3, 2024

Denial of service in Red Hat Undertow 2.x allows remote authenticated users to hang EJB request handling with a truncated HTTP request. UndertowInputStream performs an unbounded blocking read while waiting for the omitted LAST_CHUNK marker instead of enforcing a read timeout. Exploitation requires high privileges, user interaction, and an established connection carrying an otherwise valid EJB invocation.

CVSS severity4.2
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Red Hat Undertow 2.x allows remote authenticated users to hang EJB request handling with a truncated HTTP request. UndertowInputStream performs an unbounded blocking read while waiting for the omitted LAST_CHUNK marker instead of enforcing a read timeout. Exploitation requires high privileges, user interaction, and an established connection carrying an otherwise valid EJB invocation.

The record

CVE
CVE-2022-2764
Published
Sep 1, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Undertow
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 1, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=undertow 2.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Red Hat · Undertowversion=undertow 2.x

Published CVSS scores

4.9NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.2Red HatCVSS:3.1/AV:N/AC:H/PR:H/UI:R/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
Privilegesadmin
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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo