Security readout for executives and security teams
Plain-English summary
This CVE affects JetBrains TeamCity Server on Windows before version 2020.2.4 and could allow arbitrary code execution on the server. For executives, the concern is that a compromised CI/CD server can affect build integrity and downstream software delivery. The public bundle does not provide CVSS, prerequisites, or exploit detail.
Executive priority
Prioritize remediation for any Windows TeamCity Server below 2020.2.4, especially internet-accessible or production build systems. Business urgency is high because CI/CD compromise can affect software integrity, but the provided evidence does not confirm active exploitation.
Technical view
CVE-2021-31914 describes arbitrary code execution in JetBrains TeamCity Server before 2020.2.4 on Windows. The provided sources do not identify a CWE, attack vector, authentication requirement, or specific vulnerable component. Treat the issue as server-side RCE with incomplete public technical detail.
Likely exposure
Exposure is limited by the provided evidence to TeamCity Server installations running on Windows with versions earlier than 2020.2.4. The bundle does not support claims about other operating systems, hosted services, plugins, or non-server components.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. No public exploit status, exploit maturity, or attacker behavior is provided. Do not assume exploitation without additional vendor or threat-intelligence confirmation.
Researcher notes
Key missing details are attack vector, authentication requirement, vulnerable component, CWE, CVSS, and exploit status. Analysis should remain scoped to Windows TeamCity Server before 2020.2.4 unless additional JetBrains or CVE data supports broader claims.
Mitigation direction
- Inventory TeamCity Server deployments running on Windows.
- Upgrade affected TeamCity Server instances to 2020.2.4 or later.
- Review the JetBrains security bulletin for any vendor-specific instructions.
- Restrict TeamCity administrative access while remediation is pending.
- Prioritize audit review for build configuration and credential changes.
Validation and detection
- Confirm the operating system for each TeamCity Server instance.
- Verify TeamCity Server version is not earlier than 2020.2.4.
- Check JetBrains bulletin coverage against deployed TeamCity versions.
- Review server logs for unexpected administrative or build activity.
- Confirm CI/CD secrets and service accounts were not modified.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-31914 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.