CVE-2021-31403— Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8
Quick assessment
Affected
Vaadin Vaadin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Vaadin framework是一个应用软件。一个使用纯Java有效地构建现代Web应用程序，而无需接触低级Web技术得应用框架。 Vaadin framework 存在安全漏洞，该漏洞允许攻击者通过定时攻击猜测安全令牌。以下产品及版本受到影响：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 throug
Possible ATT&CK Techniques 1 AI
T1595 · Active Scanning
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I. Basic Information for CVE-2021-31403
Vulnerability Information
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Vulnerability Title
Timing side channel vulnerability in UIDL request handler in Vaadin 7 and 8
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Vaadin framework 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vaadin framework是一个应用软件。一个使用纯Java有效地构建现代Web应用程序，而无需接触低级Web技术得应用框架。 Vaadin framework 存在安全漏洞，该漏洞允许攻击者通过定时攻击猜测安全令牌。以下产品及版本受到影响：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 throug
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Vaadin | Vaadin | 7.0.0 ~ * | - |
|
| Vaadin | vaadin-server | 7.0.0 ~ * | - |
|
II. Public POCs for CVE-2021-31403
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2021-31403 (2)
-
https://github.com/vaadin/framework/pull/12188 x_refsource_MISC
-
https://github.com/vaadin/framework/pull/12190 x_refsource_MISC
Other References for CVE-2021-31403 (1)
-
https://vaadin.com/security/cve-2021-31403 x_refsource_MISC
Same Patch Batch · Vaadin · 2021-04-23 · 13 CVEs total
| CVE-2021-31407 | 8.6 HIGH | Server classes and resources exposure in OSGi applications using Vaadin 12-14 and 19 |
| CVE-2021-31410 | 8.6 HIGH | Project sources exposure in Vaadin Designer |
| CVE-2020-36320 | 7.5 HIGH | Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7 |
| CVE-2021-31405 | 7.5 HIGH | Regular expression denial of service (ReDoS) in EmailField component in Vaadin 14 and 15-1 |
| CVE-2021-31408 | 6.3 MEDIUM | Server session is not invalidated when logout() helper method of Authentication module is |
| CVE-2019-25027 | 6.1 MEDIUM | Reflected cross-site scripting in default RouteNotFoundError view in Vaadin 10 and 11-13 |
| CVE-2020-36321 | 5.9 MEDIUM | Directory traversal in development mode handler in Vaadin 14 and 15-17 |
| CVE-2019-25028 | 5.4 MEDIUM | Stored cross-site scripting in Grid component in Vaadin 7 and 8 |
| CVE-2021-31404 | 4.0 MEDIUM | Timing side channel vulnerability in UIDL request handler in Vaadin 10, 11-14, and 15-18 |
| CVE-2021-31406 | 4.0 MEDIUM | Timing side channel vulnerability in endpoint request handler in Vaadin 15-19 |
| CVE-2020-36319 | 3.1 LOW | Potential sensitive data exposure in applications using Vaadin 15 |
| CVE-2018-25007 | 2.6 LOW | Unauthorized client-side property update in UIDL request handler in Vaadin 10 and 11 |
IV. Related Vulnerabilities
Same product: Vaadin
-
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CVE-2026-2741
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CVE-2025-15022
Cross-site scripting in Action caption
Same vendor: Vaadin
-
CVE-2026-93547
Missing Authorization Check in Vaadin Spreadsheet Allows Cel -
CVE-2026-91860
Prototype Pollution in Vaadin Charts and Component Base via -
CVE-2026-7860
Possible information disclosure of environment variables in -
CVE-2026-2742
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CVE-2026-2741
Zip Slip Path Traversal on Node Unpack
Same weakness: CWE-208
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CVE-2026-18040
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V. Comments for CVE-2021-31403
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