CVE-2020-36320
Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
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.
- Record
CVE-2020-36320- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
EUVDEUVD-2021-0750
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.
- Record
EUVD-2021-0750- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-42j4-733x-5vcf
Regular expression denial of service (ReDoS) in EmailValidator class in Vaadin 7
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.
- Record
GHSA-42j4-733x-5vcf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2020-36320- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2020-36320- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVGHSA-42j4-733x-5vcf
Regular expression denial of service (ReDoS) in EmailValidator class in Vaadin 7
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.
- Record
GHSA-42j4-733x-5vcf- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
com.vaadin:vaadin-bomMaven |
7.0.0.beta1 up to 7.7.22 | 7.7.22 |
com.vaadin:vaadin-serverMaven |
7.0.0.beta1 up to 7.7.22 | 7.7.22 |
com.vaadin:vaadin-bomMaven |
7.0.0.beta1 up to 7.7.22, plus listed versions 7.4.07.4.17.4.27.4.37.4.4 Show 45 moreShow less7.4.57.4.67.4.77.4.87.5.07.5.0.beta17.5.0.beta27.5.0.beta37.5.0.rc17.5.0.rc27.5.17.5.107.5.27.5.37.5.47.5.57.5.67.5.77.5.87.5.97.6.07.6.0.alpha17.6.0.alpha27.6.17.6.27.6.37.6.47.6.57.6.67.6.77.6.87.7.07.7.17.7.107.7.117.7.127.7.137.7.147.7.157.7.167.7.177.7.27.7.37.7.47.7.5 |
7.7.22 |
com.vaadin:vaadin-serverMaven |
7.0.0.beta1 up to 7.7.22, plus listed versions 7.0.07.0.0.beta107.0.0.beta117.0.0.beta27.0.0.beta3 Show 45 moreShow less7.0.0.beta47.0.0.beta57.0.0.beta67.0.0.beta77.0.0.beta87.0.0.beta97.0.0.rc17.0.0.rc27.0.17.0.27.0.37.0.47.0.57.0.67.0.77.1.07.1.0.beta17.1.17.1.107.1.117.1.127.1.137.1.147.1.157.1.27.1.37.1.47.1.57.1.67.1.77.1.87.1.97.2.07.2.0.beta17.2.17.2.27.2.37.2.47.2.57.2.67.2.77.3.07.3.0.alpha17.3.0.alpha27.3.0.alpha3 |
7.7.22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-36320 is a high vulnerability (CVSS 7.5) in Vaadin, published April 19, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.96%, the 80th percentile. Fixed in com.vaadin:vaadin-bom 7.7.22.
References
Left out here: 89 versions. The JSON record has them.