Security readout for executives and security teams
Plain-English summary
CVE-2020-36319 is a low-severity sensitive data exposure issue in Vaadin 15 applications. The risk appears when affected Vaadin Flow server versions are used with REST controllers, potentially exposing data that developers did not intend to return.
Executive priority
Treat this as a targeted cleanup item, not an emergency. Prioritize if affected Vaadin 15 applications expose REST APIs handling sensitive customer, identity, or business data.
Technical view
The issue involves insecure default ObjectMapper configuration in com.vaadin:flow-server 3.0.0 through 3.0.5, corresponding to Vaadin 15.0.0 through 15.0.4. It is classified as CWE-200 with CVSS 3.1, requiring low privileges and high attack complexity.
Likely exposure
Exposure is limited to applications using the affected Vaadin or flow-server versions and also exposing REST controller functionality such as @RestController. Vaadin-only UI applications without such REST data paths may not be affected based on the provided description.
Exploitation context
The bundle does not cite public exploitation, and the CVE is not listed as KEV. The CVSS vector indicates network reachability, low privileges, no user interaction, and limited confidentiality impact, but high attack complexity.
Researcher notes
Evidence is narrow: the vulnerable condition requires affected Vaadin Flow server versions plus REST serialization paths. The bundle does not provide exploit details, named patches, or broad product impact beyond Vaadin and flow-server.
Mitigation direction
- Inventory Vaadin and com.vaadin:flow-server versions in application dependencies.
- Check the Vaadin advisory for vendor-approved remediation or upgrade guidance.
- Prioritize moving affected applications off Vaadin 15.0.0 through 15.0.4.
- Review REST controllers for unintended sensitive field serialization.
- Reduce exposure of affected REST endpoints until remediation is confirmed.
Validation and detection
- Confirm whether flow-server is version 3.0.0 through 3.0.5.
- Confirm whether the application uses @RestController or similar REST endpoints.
- Review REST responses for unintended sensitive fields in non-production testing.
- Check access controls for endpoints returning user or business data.
- Document affected services and remediation status for tracking.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-36319 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N1.61.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.1LowVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://vaadin.com/security/cve-2020-36319CVE reference · x_refsource_MISC
- https://github.com/vaadin/flow/pull/8016CVE reference · x_refsource_MISC
- https://github.com/vaadin/flow/pull/8051CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.