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CVE-2023-4639

Undertow: cookie smuggling/spoofing

High7.4EPSS 1.1%
Published
Updated
Reserved
Assigned by
redhat

Description

A flaw was found in Undertow, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. This issue could allow an attacker to construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification. The main threat from this flaw impacts data confidentiality and integrity.

Timeline

  1. ID reserved

    By redhat

  2. · 15 months later

    Published

  3. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-4639, by who scored it
Scored byCVSSScoreVector
redhatCNA (assigner)3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Deferred3.1High7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
1.1% · top 34% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

Affected products

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (10)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .