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Exploited vulnerability · CISA KEV

Is CVE-2024-27199 exploited? Yes: in CISA KEV since 20 Apr 2026

Gociux · JetBrains TeamCity · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-27199, JetBrains TeamCity Relative Path Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 20 Apr 2026, 777 days after it was published. It is known to be used in ransomware campaigns. It affects JetBrains TeamCity. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 20 Apr 2026
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity7.3CVSS 3.1 · high
US federal due4 May 2026BOD 22-01 deadline

What it is

JetBrains TeamCity contains a relative path traversal vulnerability that could allow limited admin actions to be performed.

VendorJetBrains (4 exploited CVEs in KEV)
ProductTeamCity
VulnerabilityJetBrains TeamCity Relative Path Traversal Vulnerability
WeaknessCWE-23
Published4 Mar 2024
Added to KEV20 Apr 2026
Reported by (CNA)JetBrains

What to do

  1. Check whether you run it. Look for TeamCity in your asset inventory, including appliances and cloud images. Stack check lists every exploited JetBrains CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 4 Mar 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for JetBrains.

Other exploited CVEs in TeamCity

References

Questions

Is CVE-2024-27199 being exploited?

Yes. CISA added CVE-2024-27199 to the Known Exploited Vulnerabilities catalog on 20 Apr 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-27199 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2024-27199?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check JetBrains's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected TeamCity and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2026 · JetBrains scorecard · act-now radar.

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