CVE-2021-31406 - CVE House
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Status published Medium CVE-2021-31406

Timing side channel vulnerability in endpoint request handler in Vaadin 15-19

Vulnerability Description

Non-constant-time comparison of CSRF tokens in endpoint request handler in com.vaadin:flow-server versions 3.0.0 through 5.0.3 (Vaadin 15.0.0 through 18.0.6), and com.vaadin:fusion-endpoint version 6.0.0 (Vaadin 19.0.0) allows attacker to guess a security token for Fusion endpoints via timing attack.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • This issue was discovered and responsibly reported by Xhelal Likaj.

References

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Affected Vendor

Affected Software

Vaadin, flow-server
Vulnerable Versions:
19.0.0, 15.0.0, 6.0.0, 3.0.0

Timeline

Official Publish: April 23rd, 2021
Last Modified: September 17th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weaknesses (CWE)

CWE-208

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.