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Not in CISA KEV
HIGH severity

CVE-2020-36320 — vaadin-bom

HIGHFix: vaadin/framework#12104

CVE-2020-36320 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in com.vaadin:vaadin-bom. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for com.vaadin:vaadin-bom — see the affected versions and patch details below.

Regular expression denial of service (ReDoS) in EmailValidator class in Vaadin 7

Also known asGHSA-42j4-733x-5vcf
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
1 known
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk
0.22%0.97%1.71%2.46%0.7%2.0%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕com.vaadin:vaadin-bom☕com.vaadin:vaadin-server

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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 Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavencom.vaadin:vaadin-bom≥ 7.0.0.beta1&&< 7.7.227.7.22com.vaadin:vaadin-bom:7.7.22
☕Mavencom.vaadin:vaadin-server≥ 7.0.0.beta1&&< 7.7.227.7.22com.vaadin:vaadin-server:7.7.22

Affected Products

1 product · 1 configurations
Application
vaadinvaadin
≥ 7.0.0 && < 7.7.22
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Unsafe validation RegEx in EmailValidator class in com.vaadin:vaadin-ser…

github.comNVDMay 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.vaadin:vaadin-bom, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update com.vaadin:vaadin-bom to 7.7.22 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-36320 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

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. - https://vaadin.com/security/cve-2020-36320
O3 Security · Impact-Aware SCA

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CVE-2020-36320: vaadin-bom — Fixed in 7.7.22