Security readout for executives and security teams
Plain-English summary
CVE-2021-31910 is an information disclosure issue in JetBrains TeamCity versions before 2020.2.3. The source describes the cause as SSRF, meaning the TeamCity server could be induced to make unintended server-side requests. The public bundle does not provide CVSS, affected component details, or exploit specifics.
Executive priority
Prioritize normal vulnerability remediation, escalating if TeamCity is exposed to untrusted users or networks. The issue affects CI/CD infrastructure, but the public evidence does not justify claims of active exploitation or critical severity.
Technical view
JetBrains TeamCity before 2020.2.3 allowed information disclosure through server-side request forgery. Available sources identify the product, fixed version boundary, and vulnerability class, but do not describe the vulnerable endpoint, authentication requirements, reachable data, or practical exploit conditions.
Likely exposure
Exposure is limited to organizations running JetBrains TeamCity versions earlier than 2020.2.3. Internet-facing or broadly reachable TeamCity instances warrant faster triage, but the source bundle does not confirm prerequisites or affected configurations.
Exploitation context
The provided data does not show CISA KEV listing or active exploitation. No cited source in the bundle provides public exploit status, exploit maturity, or attack prevalence.
Researcher notes
Key gaps are CVSS, CWE, vulnerable endpoint, authentication requirement, and disclosure impact. Treat the available description as a fixed-version boundary and SSRF classification, not enough detail for exploitability conclusions.
Mitigation direction
- Inventory TeamCity instances and confirm exact running versions.
- Upgrade any TeamCity deployment older than 2020.2.3.
- Check JetBrains security guidance for any version-specific remediation notes.
- Restrict network access to TeamCity while remediation is pending.
- Review logs for unusual TeamCity-initiated outbound requests.
Validation and detection
- Confirm TeamCity reports version 2020.2.3 or later.
- Verify no production TeamCity server remains on an earlier version.
- Check asset records for unmanaged or legacy TeamCity deployments.
- Review firewall rules limiting access to TeamCity administration surfaces.
- Document any compensating controls if immediate upgrade is delayed.
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.
Cloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-31910 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.