CVE-2018-2391
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 · uneditedUnder certain conditions a malicious user can prevent legitimate users from accessing the SAP Internet Graphics Server (IGS), 7.20, 7.20EXT, 7.45, 7.49, 7.53, via IGS portwatcher service.
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 confidenceThis is a Denial of Service (DoS) vulnerability in SAP Internet Graphics Server (IGS) portwatcher service affecting versions 7.20, 7.20EXT, 7.45, 7.49, and 7.53. Under certain conditions, a malicious user can prevent legitimate users from accessing the IGS by exploiting the portwatcher service, which handles connection management.
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= 7.20= 7.20ext= 7.45= 7.49= 7.53CVSS 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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Verify SAP IGS installationLocate SAP Internet Graphics Server binaries and executables in the SAP system directory structure. Check for igs or portwatcher related processes or services.Affected if SAP IGS is installed on the system
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Check IGS versionQuery the installed IGS version using SAP command line tools (e.g., SAPCAR, SMDA, or version display utilities) or inspect version information in SAP system profiles. Compare the version string to the affected list: 7.20, 7.20EXT, 7.45, 7.49, or 7.53.Affected if Installed version matches exactly 7.20, 7.20EXT, 7.45, 7.49, or 7.53
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Identify portwatcher service statusCheck if the portwatcher service (portwatcher.exe or similar) is running or enabled. This can be done by examining running processes, Windows services (if Windows), or system service configurations. Look for processes named portwatcher or related to IGS connection management.Affected if Portwatcher service is active or configured to run
The environment is affected if SAP IGS is installed with version 7.20, 7.20EXT, 7.45, 7.49, or 7.53 AND the portwatcher service is enabled and handling connections.
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 dataApply the relevant SAP security patch for CVE-2018-2391 and review portwatcher service access controls to prevent unauthorized users from triggering the DoS condition.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-2391 — 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-2018-2391 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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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.
- 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