Security readout for executives and security teams
Plain-English summary
This CVE describes remote code execution in JetBrains TeamCity before version 2020.2.4 through OS command injection. For executives, the concern is control of a build server, which may expose source code, signing material, credentials, deployment paths, and CI/CD integrity.
Executive priority
Prioritize remediation for any production or internet-accessible TeamCity server below 2020.2.4. Even without confirmed active exploitation in the provided sources, RCE in CI/CD infrastructure can create business-wide compromise paths.
Technical view
The supplied sources state that JetBrains TeamCity versions before 2020.2.4 allowed OS command injection leading to remote code execution. No CVSS, CWE, CPE, attack prerequisites, or affected component details are provided in the bundle, so technical validation should focus on confirmed TeamCity version and exposure.
Likely exposure
Exposure is limited to organizations running JetBrains TeamCity before 2020.2.4. Risk is highest for internet-facing, partner-accessible, or broadly reachable CI servers. The bundle does not provide CPEs or detailed affected version ranges beyond before 2020.2.4.
Exploitation context
The supplied bundle does not show active exploitation, and the CVE is not marked KEV. It also does not provide public exploit status or exploitation prerequisites. Treat it as high-impact because successful RCE on TeamCity can affect build integrity and sensitive CI/CD assets.
Researcher notes
The record is sparse: no CVSS, CWE, CPEs, vulnerable endpoint, exploit prerequisites, or fixed-build notes beyond the before 2020.2.4 version boundary. Avoid assuming authentication state or exploitability details without vendor advisory evidence.
Mitigation direction
- Upgrade TeamCity to 2020.2.4 or later after checking JetBrains guidance.
- Restrict TeamCity access to trusted networks and authenticated users.
- Review TeamCity secrets, tokens, and deployment credentials for rotation needs.
- Audit build agents connected to affected TeamCity servers.
- Monitor vendor advisories for any additional remediation guidance.
Validation and detection
- Inventory all TeamCity servers and record exact versions.
- Flag any TeamCity instance older than 2020.2.4.
- Confirm whether affected instances are internet-facing or broadly reachable.
- Review TeamCity logs for unusual administrative or process activity.
- Document compensating controls for any instance awaiting upgrade.
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-2021-31915 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.