---
title: "CVE-2024-27198: JetBrains TeamCity Authentication Bypass Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-27198/
description: "CVE-2024-27198 (JetBrains TeamCity): Exploited in the wild (CISA KEV). In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-03-04
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-27198"
kev: true
cvss: 9.8
epss: 0.99938
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-27198: JetBrains TeamCity Authentication Bypass Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run JetBrains TeamCity. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-03-07, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-03-28 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 99.9% , percentile 100.0: FIRST’s model estimates a 99.9% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible

## Affected products (CVE record)

- JetBrains TeamCity: < 2023.11.4

## Severity

- JetBrains CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-03-07; federal due date 2024-03-28. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.94% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [Listed in CISA KEV notes (jetbrains.com)](https://www.jetbrains.com/help/teamcity/teamcity-2023-11-4-release-notes.html)
- [Listed in CISA KEV notes (blog.jetbrains.com)](https://blog.jetbrains.com/teamcity/2024/03/additional-critical-security-issues-affecting-teamcity-on-premises-cve-2024-27198-and-cve-2024-27199-update-to-2023-11-4-now/)
- [CVE.org record CVE-2024-27198](https://www.cve.org/CVERecord?id=CVE-2024-27198)
- [NVD entry CVE-2024-27198](https://nvd.nist.gov/vuln/detail/CVE-2024-27198)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27198)
- [jetbrains.com](https://www.jetbrains.com/privacy-security/issues-fixed/)
- [darkreading.com](https://www.darkreading.com/cyberattacks-data-breaches/jetbrains-teamcity-mass-exploitation-underway-rogue-accounts-thrive)

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Source page: https://erroneo.us/security/cve/CVE-2024-27198/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt