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TeamcityApplication · Jetbrains

CVE-2019-15042

HIGH · 7.5 CVSS v3.1 Published 2019-10-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An issue was discovered in JetBrains TeamCity 2018.2.4. It had no SSL certificate validation for some external https connections. This was fixed in TeamCity 2019.1.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

TeamCity 2018.2.4 had disabled SSL certificate validation for certain external HTTPS connections, allowing man-in-the-middle attackers to intercept and modify encrypted traffic by presenting fraudulent certificates.

MitigationUpgrade to TeamCity 2019.1 or later where SSL certificate validation was properly implemented. Avoid using TeamCity on untrusted networks until the upgrade is completed.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
TeamcityApplication
Affected:= 2018.2.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm TeamCity installation
    Identify whether JetBrains TeamCity is deployed in your environment
    Affected if TeamCity is not installed, this CVE does not apply
  2. Determine installed TeamCity version
    Check the exact version number of the TeamCity installation
    Affected if The installed version is 2018.2.4 specifically (only this exact version is affected)
  3. Identify external HTTPS connections
    Determine if TeamCity is configured to make outbound HTTPS connections to external services or endpoints
    Affected if External HTTPS connections are in use and the version is 2018.2.4 - the SSL certificate validation is disabled for these connections, allowing potential interception

You are affected only if TeamCity version 2018.2.4 is installed AND it makes outbound HTTPS connections to external services; other versions are not vulnerable to this specific issue.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to TeamCity 2019.1 or later where SSL certificate validation was properly implemented. Avoid using TeamCity on untrusted networks until the upgrade is completed.

Fix this in Teamcity Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-15042 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data