CVE-2024-27199VulnerabilityPublished 4 Mar 2024Updated 21 Apr 2026

CVE-2024-27199: JetBrains TeamCity · CWE-23

Affects JetBrains TeamCitySource CVE Database V5

Exploited in the wild · used in ransomware campaigns · KEV due 4 May 2026 · public detection template (Nuclei) · 99% EPSS : upgrade to 2023.11.4 now.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

7.3High

How severe the flaw is on the 0–10 CVSS scale.

KEV deadline: 4 May 2026 US federal agencies must patch by this date; a sensible deadline for everyone else.
Ransomware: Used in ransomware campaigns
EPSS: 99.9% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2023.11.4

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 4 Mar 2024
Detectable: evidence found.
nuclei template: TeamCity < 2023.11.4 - Authentication Bypass
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 2.1 years after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by JetBrains
2024-02-2109:53Z, 12 days before disclosure
CVE published
on cve.org
2024-03-0417:21Z, t = 0
Added to CISA KEV (opens in a new tab)
exploitation confirmed · ransomware use known
2026-04-20, 2.1 years after disclosure
KEV remediation due
US federal deadline
2026-05-04, 2.2 years after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade org.jetbrains.teamcity/teamcity-server to 2023.11.4.

Affected software

Product	Affected	Fixed in
Mavenorg.jetbrains.teamcity/teamcity-server`pkg:maven/org.jetbrains.teamcity/teamcity-server`Other threats	Affected <2023.11.4	Fixed in 2023.11.4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

CVE-2024-27199 is a path traversal vulnerability in JetBrains TeamCity versions before 2023.11.4. This flaw allows an unauthenticated attacker to perform limited administrative actions by exploiting improper input validation of file paths. The vulnerability has a CVSS score of 7.3, indicating high severity, with potential impacts on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.

Impact

Successful exploitation could allow an attacker to perform limited administrative actions on affected TeamCity servers, potentially leading to partial compromise of confidentiality, integrity, and availability of the system. The vulnerability is remotely exploitable without authentication, increasing risk. However, no known exploits in the wild have been reported so far.

Mitigation

Upgrade JetBrains TeamCity to version 2023.11.4 or later, where this path traversal vulnerability is fixed. Since the product is not a cloud service, remediation requires manual patching by the user. Patch status is not explicitly confirmed by a vendor advisory link in the provided data; therefore, verify the vendor's official advisory for the latest remediation guidance.

Summary

JetBrains TeamCity before version 2023.11.4 contains a CWE-23 path traversal vulnerability (CVE-2024-27199) that enables an unauthenticated attacker to perform limited administrative actions by manipulating file paths. The vulnerability is remotely exploitable without privileges or user interaction, with a CVSS 3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). The issue was publicly disclosed in March 2024. No direct patch link is provided, but upgrading to version 2023.11.4 or later is implied to remediate the issue.

CWE-23Relative Path Traversal (opens in a new tab)
Base weaknessOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Implementation · Input Validation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174).
Operation · Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.3.1 (opens in a new tab)
Attack patterns
Relative Path Traversal (opens in a new tab)
Manipulating Web Input to File System Calls (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Apr 2026, 06:08 UTC

Public exploits and detectiona Nuclei detection template

WeaknessesCWE-23

Technical details

References

Community reviews

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