JenkinsApplication
CVE-2018-1999044
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 · uneditedA denial of service vulnerability exists in Jenkins 2.137 and earlier, 2.121.2 and earlier in CronTab.java that allows attackers with Overall/Read permission to have a request handling thread enter an infinite loop.
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 · high confidenceA denial of service vulnerability in Jenkins CronTab.java allows attackers with Overall/Read permission to cause request handling threads to enter an infinite loop by providing specially crafted input, exhausting server resources.
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
JenkinsApplication
<= 2.121.2<= 2.137CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:L/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 Jenkins versionAccess the Jenkins web UI and check the version displayed at the bottom-right of the page, or query the Jenkins API by visiting /api/json on your Jenkins serverAffected if The version is 2.137 or earlier, or 2.121.2 or earlier (for LTS releases)
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Confirm Overall/Read permission configurationNavigate to Manage Jenkins > Manage Users > security configuration, or check the authorization matrix under Manage Jenkins > Configure Global Security. Look for Overall/Read permission assigned to anonymous users or untrusted accountsAffected if Anonymous users or non-admin users have Overall/Read permission enabled (this is the default in many Jenkins installations)
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Verify CronTab functionality is accessibleConfirm that users with Overall/Read permission can access job configuration pages where cron syntax can be entered, or check if the CronTab API endpoint is reachable without admin privilegesAffected if Users with only Overall/Read permission can reach areas that accept cron expression input
Your environment is affected if your Jenkins version falls within 2.137 or earlier (or 2.121.2 or earlier for LTS), AND anonymous or untrusted users have the default Overall/Read permission that allows them to submit specially crafted cron expressions.
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 dataUpgrade Jenkins to version 2.138 or later (or 2.121.3 or later for the 2.x LTS line). If immediate upgrade is not feasible, restrict Overall/Read permission to only trusted users to reduce the attack surface.
Fix this in Jenkins
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 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 $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-1999044 — 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-2018-1999044 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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