Known exploited vulnerability
CVE-2024-27199
The short answer
CVE-2024-27199 affects JetBrains TeamCity and is rated high (CVSS 7.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-20: attackers are using it, so patch it first.
What it is
Severity
7.3 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Exploited (CISA KEV)
Yes, since Apr 20, 2026
Federal due date May 4, 2026
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- Low
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
TeamCity. NVD's record lists the exact affected versions.
References
- www.darkreading.com/cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thrive Press/Media Coverage
- www.jetbrains.com/privacy-security/issues-fixed/ Vendor Advisory
- www.darkreading.com/cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thrive Press/Media Coverage
- www.jetbrains.com/privacy-security/issues-fixed/ Vendor Advisory
- github.com/Stuub/RCity-CVE-2024-27198/blob/main/RCity.py Exploit
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27199 US Government Resource
Questions
Is CVE-2024-27199 being exploited?
Yes. CISA added CVE-2024-27199 to its Known Exploited Vulnerabilities catalog on 2026-04-20, with a federal remediation due date of 2026-05-04. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2024-27199?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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