CVE-2024-27199 — JetBrains
HIGHCVE-2024-27199 is a high-severity (CVSS 7.3) CWE-23 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-04-20) and has been used in ransomware campaigns — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-04-20 — including use in ransomware campaigns. Federal agencies were required to remediate by 2026-05-04.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2024-27199.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2024-27199 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 395,249 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible
Affected Products
teamcityjetbrainsResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2024-27199 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
How to detect CVE-2024-27199
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-27199 -u https://target- Template
- TeamCity < 2023.11.4 - Authentication Bypass
- Severity
- high
- Impact
- Unauthenticated attackers can perform limited administrative actions on TeamCity servers via path traversal, potentially accessing sensitive build information.
- Remediation
- Update JetBrains TeamCity to version 2023.11.4 or later.
Template by ProjectDiscovery nuclei-templates (DhiyaneshDk), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2024-27199 in your dependencies?
Find it across , including transitive dependencies.