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CVE-2020-36320

22
FAUCET Score

CVE-2020-36320 describes an uncontrolled resource consumption vulnerability in the EmailValidator class within Vaadin versions 7.0.0 through 7.7.21. An attacker can trigger this denial-of-service condition by submitting specially crafted, malicious email addresses due to unsafe regular expression validation. This vulnerability carries a CVSS score of 7.5 (HIGH), indicating a severe impact on availability with low attack complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, < 7.7.22CPE matchmatch criteria
cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.96%
Probability of exploitation in next 30 days
EPSS Percentile
78.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0196 is in the 62nd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: com.vaadin:vaadin-bomFixed in: 7.7.22
mavenpatch availablevia ghsa
Product: com.vaadin:vaadin-serverFixed in: 7.7.22

Vendor Advisories (1)

mavenGHSA-42j4-733x-5vcfhigh

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

Apr 19, 2021

References

github.com / vaadin/framework/issues/7757
ExploitPatchThird Party Advisory
github.com / vaadin/framework/pull/12104
PatchThird Party Advisory
vaadin.com / security/cve-2020-36320
Vendor Advisory