What’s Vulnerable › Vulnerabilities

CVE-2020-36320: Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-23 · updated 2026-06-17
• Weakness: CWE-400

Description

Unsafe validation RegEx in EmailValidator class in com.vaadin:vaadin-server versions 7.0.0 through 7.7.21 (Vaadin 7.0.0 through 7.7.21) allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses.

Affected products

• Vaadin: from 7.0.0 before 7.7.22 — fixed in 7.7.22

How to fix

Upgrade to a fixed version: Vaadin 7.7.22. Check the vendor advisory for mitigations.

References

• https://github.com/vaadin/framework/issues/7757
• https://github.com/vaadin/framework/pull/12104
• https://vaadin.com/security/cve-2020-36320
• https://github.com/vaadin/framework/issues/7757
• https://github.com/vaadin/framework/pull/12104
• https://vaadin.com/security/cve-2020-36320

Get alerted when CVE-2020-36320 or the next vulnerability affects your stack