CVE-2020-36320 json
Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
published 2021-04-19 5 y ago modified 2026-06-17 4 mo ago also GHSA-42j4-733x-5vcf , EUVD-2021-0750
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven com.vaadin:vaadin-bom 7.7.22
- maven com.vaadin:vaadin-server 7.7.22
- vaadin vaadin 7.7.22
- github.com/vaadin/framework#12104 pull request
- github.com/vaadin/framework/issues/7757 advisory
Exploit prediction
1.96% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/vaadin/framework/issues/7757 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | com.vaadin:vaadin-bom | >=7.0.0.beta1, <7.7.22 |
7.7.22 |
| maven | com.vaadin:vaadin-server | >=7.0.0.beta1, <7.7.22 |
7.7.22 |
Affected products
- Vaadin Vaadin
- Vaadin vaadin-server
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/vaadin/framework/pull/12104
web, patch, third-party-advisory
-
github.com
/vaadin/framework/issues/7757
web, exploit, patch, third-party-advisory
-
vaadin.com
/security/cve-2020-36320
web, vendor-advisory
-
github.com
/vaadin/framework/security/advisories/GHSA-42j4-733x-5vcf
web
-
nvd.nist.gov
/vuln/detail/CVE-2020-36320
advisory
Sources
- CVE List CVE-2020-36320
- GitHub Advisory GHSA-42j4-733x-5vcf
- NVD CVE-2020-36320
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