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CVE-2020-36321

22
FAUCET Score

CVE-2020-36321 is a path traversal vulnerability affecting Vaadin Flow versions 2.0.0 through 2.4.1 (Vaadin 14.0.0-14.4.2) and Vaadin 15 through 18 (prior to 5.0). An attacker can exploit improper URL validation in development mode to access arbitrary files outside the intended frontend resources folder. Rated 7.5 HIGH, this vulnerability allows unauthenticated remote attackers to achieve high confidentiality impact with low attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 2.4.2CPE matchmatch criteria
cpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
>= 3.0.0, < 5.0.0CPE matchmatch criteria
cpe:2.3:a:vaadin:flow:*:*:*:*:*:*:*:*
>= 14.0.0, < 14.4.3CPE matchmatch criteria
cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*
>= 15.0.0, < 18.0.0CPE matchmatch criteria
cpe:2.3:a:vaadin:vaadin:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0121 is in the 44th percentile among its peer group of 51,553 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:flow-serverFixed in: 5.0.0
mavenpatch availablevia ghsa
Product: com.vaadin:flow-serverFixed in: 2.4.2

Vendor Advisories (1)

mavenGHSA-49r2-73m6-pp8fmedium

Directory traversal in development mode handler in Vaadin 14 and 15-17

Apr 19, 2021

References

github.com / vaadin/flow/pull/9392
PatchThird Party Advisory
vaadin.com / security/cve-2020-36321
Vendor Advisory