Vulnerability · Published Apr 23, 2021 · Assigned by Vaadin
CVE-2021-31406Timing side channel vulnerability in endpoint request handler in Vaadin 15-19
Medium 4.0
In plain English
A medium-severity security flaw in flow-server from Vaadin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 88.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | com.vaadin:flow-server | 5.0.4 | GHSA-p7jq-v8jp-j424 |
| Maven | com.vaadin:flow-server | 6.0.1 | GHSA-p7jq-v8jp-j424 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Vaadin | Vaadin | 19.0.015.0.0 – before * |
| Vaadin | flow-server | 6.0.03.0.0 – before * |
Weakness: CWE-208 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://vaadin.com/security/cve-2021-31406 x_refsource_MISC
- https://github.com/vaadin/flow/pull/10157 x_refsource_MISC