Home/CVE/Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7
CVE

CVE-2021-31403

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7

Non-constant-time comparison of CSRF tokens in UIDL request handler in com.vaadin:vaadin-server versions 7.0.0 through 7.7.23 (Vaadin 7.0.0 through 7.7.23), and 8.0.0 through 8.12.2 (Vaadin 8.0.0 through 8.12.2) allows attacker to guess a security token via timing attack.

MEDIUM · CVSS 4 EPSS 0.00128
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-203Observable Discrepancy
CWE-208Observable Timing Discrepancy
▤

Affected Products & Versions

2
vaadin>= 7.0.0 and < 7.7.24
vaadin>= 8.0.0 and < 8.12.3
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven com.vaadin:vaadin-bom MODERATE fixed in 7.7.24
Maven com.vaadin:vaadin-server MODERATE fixed in 7.7.24
▣

Scoring & Timeline

4
MEDIUM · CVSS v3.1 · security@vaadin.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Apr 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/vaadin/framework/pull/12188PatchThird Party Advisory
https://github.com/vaadin/framework/pull/12190PatchThird Party Advisory
https://vaadin.com/security/cve-2021-31403Vendor Advisory
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