CVE-2020-11688
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 · uneditedIn JetBrains TeamCity before 2019.2.1, the application state is kept alive after a user ends his session.
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 confidenceIn JetBrains TeamCity versions prior to 2019.2.1, user session data and application state are not properly invalidated when a user ends their session. This session management flaw allows lingering session objects to remain active in memory after logout, potentially enabling session reuse, session fixation, or information disclosure to subsequent users who might inherit the stale session context.
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< 2019.2.1CVSS 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
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Identify installed TeamCity versionLog into the TeamCity web UI as an administrator, then navigate to the 'Administration' section and click 'About' to view the exact version number. Alternatively, check the version from the startup logs or the TeamCity server's buildServer.properties file in the <TeamCity_home>/conf directory.Affected if The displayed version is any release prior to 2019.2.1 (for example, 2019.2.0, 2019.1.x, 2018.x, or earlier)
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Confirm TeamCity is runningVerify the TeamCity server is operational by accessing the web interface URL and confirming successful authentication or login page display.Affected if TeamCity is accessible and the version cannot be determined or is confirmed to be below 2019.2.1
You are affected if your TeamCity installation version is any release older than 2019.2.1, as this is when the session invalidation flaw was addressed.
Generated from the published advisory. Verify against your own configuration.
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 data2019.2.1
Upgrade TeamCity to version 2019.2.1 or later, which contains the fix for proper session invalidation. Alternatively, if upgrading is not immediately feasible, review and implement proper session termination procedures or consider restricting concurrent session usage until the upgrade can be performed.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-11688 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-11688 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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