CVE-2023-4639Network attack vector

Cookie disclosure and spoofing via malformed quotes

Published Nov 17, 2024 · Updated Feb 7, 2025

Cookie smuggling in Undertow allows remote attackers to disclose HttpOnly cookie values or inject spoofed cookies via crafted requests. The parseCookie method fails to reject an unterminated quoted value and interprets delimiter-separated trailing text inconsistently as cookies. No authentication or user interaction is required, but exploitation requires a crafted request whose malformed cookie is interpreted differently across components.

CVSS severity7.4
High
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cookie smuggling in Undertow allows remote attackers to disclose HttpOnly cookie values or inject spoofed cookies via crafted requests. The parseCookie method fails to reject an unterminated quoted value and interprets delimiter-separated trailing text inconsistently as cookies. No authentication or user interaction is required, but exploitation requires a crafted request whose malformed cookie is interpreted differently across components.

The record

CVE
CVE-2023-4639
Published
Nov 17, 2024
Updated
Feb 7, 2025
Vendor
Red Hat
Product
Migration Toolkit for Applications 6
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Migration Toolkit for Applications 6Affected versions are unavailable in this record.
Red Hat · Red Hat JBoss Enterprise Application PlatformAffected versions are unavailable in this record.
Red Hat · Migration Toolkit for RuntimesAffected versions are unavailable in this record.

Published CVSS scores

7.4Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

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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