Security readout for executives and security teams
Plain-English summary
CVE-2021-31899 affects JetBrains Code With Me in compatible IDEs before 2021.1. A participant expected to be limited to read-only access could execute code, turning a collaboration permission boundary into a security risk.
Executive priority
Treat this as a targeted collaboration-tool risk, not a broad internet-facing emergency. Prioritize teams using older JetBrains IDEs with Code With Me, especially where external collaboration occurred.
Technical view
The flaw is a read-only mode bypass in JetBrains Code With Me bundled with compatible IDEs before version 2021.1. The provided sources do not include CVSS, CWE, a full affected product matrix, or technical root-cause details.
Likely exposure
Exposure is most likely where teams used JetBrains Code With Me collaboration sessions on IDE versions before 2021.1, especially with external or less-trusted participants assigned read-only access.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not listed as KEV. Practical risk depends on use of Code With Me sessions and trust in invited clients.
Researcher notes
Evidence is limited to the CVE description and JetBrains bulletin reference. No CVSS, CWE, affected IDE list, exploit details, or root cause are provided in the supplied bundle.
Mitigation direction
- Upgrade compatible JetBrains IDEs or Code With Me to version 2021.1 or later.
- Review JetBrains' Q1 2021 security bulletin for vendor guidance.
- Disable or restrict Code With Me sessions until version status is confirmed.
- Avoid granting collaboration access to untrusted participants on affected versions.
Validation and detection
- Inventory JetBrains IDE versions used by engineering teams.
- Confirm whether Code With Me was enabled on versions before 2021.1.
- Review collaboration policies for read-only guest sessions.
- Check JetBrains bulletin and CVE records for product-specific details.
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.
CVE-2021-31899 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://blog.jetbrains.com/CVE reference · x_refsource_MISC
- https://blog.jetbrains.com/blog/2021/05/07/jetbrains-security-bulletin-q1-2021/CVE 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.