Security readout for executives and security teams
Plain-English summary
CVE-2021-31410 is a source-code exposure issue in Vaadin Designer. A misconfigured frontend resources server can let unauthenticated remote attackers read project sources through crafted HTTP requests. The main business risk is confidentiality loss: leaked application source can reveal intellectual property, security weaknesses, secrets, or internal architecture.
Executive priority
Prioritize this for teams using Vaadin Designer, especially in shared or remotely accessible development environments. The issue can expose source code without authentication, but supplied evidence does not show active exploitation. Business urgency is high if proprietary code or embedded secrets may be exposed.
Technical view
Vaadin Designer versions 4.3.0 through 4.6.3 are described as affected. The weakness is CWE-402, overly permissive resource exposure. CVSS 3.1 is 8.6: network reachable, low complexity, no privileges, no user interaction, changed scope, high confidentiality impact, no integrity or availability impact.
Likely exposure
Exposure is most likely where affected Vaadin Designer versions are installed and the frontend resources server is reachable from untrusted networks. The bundle does not prove exposure for normal production Vaadin applications unless Designer tooling is present and reachable.
Exploitation context
The bundle says remote attackers can access project sources via crafted HTTP requests. CISA KEV status is false, and no supplied source states active exploitation. Treat exploit status as unconfirmed, not absent.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE-402 classification, and Vaadin advisory link. The affected range is stated as 4.3.0 through 4.6.3 in the description; verify exact fixed release and affected platform details with Vaadin before closure.
Mitigation direction
- Inventory Vaadin Designer installations and identify versions 4.3.0 through 4.6.3.
- Check Vaadin’s advisory for fixed versions and vendor-recommended remediation.
- Restrict network reachability to Designer tooling and its frontend resources server.
- Remove affected Designer versions where no longer required.
- Review exposed projects for secrets or sensitive source material.
Validation and detection
- Confirm installed Vaadin Designer versions across developer and build environments.
- Identify whether the frontend resources server is enabled or network reachable.
- Review access logs for unexpected requests to Designer-served project resources.
- Check exposed source trees for credentials, tokens, or sensitive configuration.
- Document remediation status against the Vaadin advisory.
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-402: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2021-31410 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
- High
- CVSS
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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:L/PR:N/UI:N/S:C/C:H/I:N/A:N3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://vaadin.com/security/cve-2021-31410CVE 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.
Transmission of Private Resources into a New Sphere ('Resource Leak')
Transmission of Private Resources into a New Sphere ('Resource Leak') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.