What products are affected by CVE-2024-27199?

CVE-2024-27199 affects JetBrains TeamCity. Refer to the vendor advisory and NVD record for affected versions.

Is there a public exploit for CVE-2024-27199?

Yes. Public exploit code or proof-of-concept has been identified for CVE-2024-27199. This lowers the barrier for exploitation and increases the urgency of patching. Organizations should prioritize remediation immediately.

What is the EPSS score for CVE-2024-27199?

CVE-2024-27199 has an EPSS score of 90.9%, placing it in the 100th percentile. This means it has a 90.9% probability of being exploited in the next 30 days, higher than 100% of all known vulnerabilities. EPSS (Exploit Prediction Scoring System) is maintained by FIRST and uses real-world threat data to estimate exploitation likelihood.

Actively Exploited — CISA KEV

CVE-2024-27199: JetBrains TeamCity High-Severity Vulnerability

Severity: High | CVSS 3.1: 7.3 | Published: 2024-03-04 | KEV Added: 2026-04-20

What is CVE-2024-27199?

In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible

Technical Analysis

Weakness Classification

This vulnerability is classified as CWE-23.

Attack Vector Breakdown

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: Low

Impact Analysis

This vulnerability is exploitable over the network, meaning any system reachable via the internet or internal network is potentially at risk without physical access. The attack complexity is low, requires no special privileges, and needs no user interaction — making it straightforward to exploit at scale.

Exploitation Probability (EPSS): 90.9% chance of exploitation in the next 30 days (100th percentile). This places the vulnerability in the highest risk tier — immediate action is critical.

Exploit Availability

Public exploit code or proof-of-concept is available for CVE-2024-27199. This significantly increases the risk of exploitation, as attackers can use or adapt existing exploit code rather than developing their own. A public exploit reference has been identified. Organizations should treat this as an urgent patching priority.

Is CVE-2024-27199 being exploited?

Yes. CVE-2024-27199 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, restricted to CVEs with confirmed active exploitation in the wild. CISA added this vulnerability on 2026-04-20. Inclusion in KEV triggers the patching mandate under BOD 22-01 for U.S. federal civilian agencies, with a remediation deadline of 2026-05-04. Additionally, public exploit code is available, which lowers the barrier for attackers.

How to fix CVE-2024-27199

Apply the security update issued by JetBrains for TeamCity. If an immediate patch is not possible, consult the vendor advisory for mitigation guidance, restrict network exposure of the affected service, and monitor logs for indicators of exploitation. CISA's Known Exploited Vulnerabilities catalog requires U.S. federal agencies to remediate this vulnerability by the due date shown below under Binding Operational Directive 22-01. Private organizations should treat KEV entries as priority-one patches because active exploitation has been confirmed in the wild.

Related Vulnerabilities

Other actively exploited vulnerabilities sharing the same weakness pattern (CWE-23):

CVE-2026-34926 (Medium 6.7) [same CWE] — A directory traversal vulnerability in the Apex One (on-premise) server could…

Frequently asked questions

Is CVE-2024-27199 critical?

CVE-2024-27199 has a CVSS 3.1 base score of 7.3 — High severity. It should be treated as a priority patch, especially given the active exploitation confirmed by CISA. The availability of public exploit code further increases the urgency.

Is CVE-2024-27199 being actively exploited?

Yes — CISA added CVE-2024-27199 to the Known Exploited Vulnerabilities catalog on 2026-04-20. Inclusion in KEV means CISA has confirmed in-the-wild exploitation. Public exploit code has also been identified, making exploitation accessible to a broader range of threat actors.

How do I patch CVE-2024-27199?

Apply the security update from JetBrains for TeamCity. Federal agencies must remediate by 2026-05-04 under BOD 22-01.

What type of vulnerability is CVE-2024-27199?

CVE-2024-27199 is classified under CWE-23.

What is the CVSS score for CVE-2024-27199?

CVE-2024-27199 has a CVSS 3.1 base score of 7.3, classifying it as High severity. The attack vector is Network, attack complexity is Low, and no privileges are required.