Analyst readout for executives and security teams
Plain-English summary
CVE-2024-27199 is a JetBrains TeamCity flaw that allowed unauthenticated network attackers to abuse path traversal and perform limited administrative actions. It affects TeamCity versions before 2023.11.4. Because CISA lists it as known exploited, internet-facing TeamCity servers should be treated as urgent exposure.
Executive priority
Treat this as urgent for any exposed TeamCity deployment. The issue is known exploited, can enable limited administrative action without authentication, and affects a build system that may hold code, secrets, and deployment paths.
Technical view
The CVE describes CWE-23 path traversal in JetBrains TeamCity before 2023.11.4, with CVSS 7.3 and network, low-complexity, no-authentication attack conditions. Impact is rated low across confidentiality, integrity, and availability, but limited admin actions make compromise operationally serious.
Likely exposure
Highest exposure is self-hosted JetBrains TeamCity reachable from the internet and not upgraded to 2023.11.4 or later. Internal-only TeamCity may still be exposed if reachable by untrusted users, compromised VPN users, or adjacent systems.
Exploitation context
Active exploitation is supported by CISA KEV listing and public reporting of TeamCity mass exploitation. The provided evidence does not prove every exposed server is compromised, but it justifies immediate inventory, upgrade verification, and account/audit review.
Researcher notes
The source bundle identifies TeamCity before 2023.11.4, CWE-23, and CVSS vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. Public details here are limited; avoid assuming full RCE from this CVE alone without separate evidence.
Mitigation direction
- Upgrade TeamCity to 2023.11.4 or later.
- Check JetBrains guidance for any additional remediation steps.
- Restrict TeamCity access to trusted networks or VPN.
- Review TeamCity administrator accounts and remove unknown users.
- Rotate credentials or tokens if compromise is suspected.
Validation and detection
- Inventory all TeamCity instances and confirm version numbers.
- Verify no instance is running before 2023.11.4.
- Review admin account creation and permission changes.
- Check access logs for unusual unauthenticated requests.
- Confirm internet exposure through external asset inventory.
Public sources used
Based on public source material and reviewed before publication.
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-23: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2024-27199 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
- 7.3 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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.
CISA KEV status
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:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.jetbrains.com/privacy-security/issues-fixed/CVE reference
- https://www.darkreading.com/cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thriveCVE reference
- https://github.com/Stuub/RCity-CVE-2024-27198/blob/main/RCity.pyCVE reference · exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27199CVE reference · government-resource
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.
Relative Path Traversal
Relative Path Traversal represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.