CVE-2018-2423
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 · uneditedSAP Internet Graphics Server (IGS), 7.20, 7.20EXT, 7.45, 7.49, 7.53, HTTP and RFC listener allows an attacker to prevent legitimate users from accessing a service, either by crashing or flooding the 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 · high confidenceSAP Internet Graphics Server (IGS) versions 7.20 through 7.53 contain a denial of service vulnerability in both HTTP and RFC listener components. An unauthenticated attacker can exploit this to crash the service or flood it with requests, preventing legitimate users from accessing the graphics rendering functionality.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/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 SAP IGS versionUse SAP transaction code SM51 to view installed server components, or check the IGS executable/version information via the SAP system. Alternatively, query the IGS service directly if accessible or check SAP system information for 'Internet Graphics Server' component version.Affected if The installed version matches 7.20, 7.20ext, 7.45, 7.49, or 7.53 exactly.
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Verify HTTP listener is exposedCheck if the SAP IGS HTTP listener port (default 4000) is open and listening on network interfaces. Use netstat or port scanning tools to confirm the HTTP service is running and accessible.Affected if The HTTP listener is enabled and reachable from network segments accessible to untrusted users.
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Verify RFC listener is exposedCheck if the SAP IGS RFC listener is registered and active in the SAP system. Use SAP transaction SM37 to monitor IGS-related background jobs or check RFC destination configurations for IGS endpoints.Affected if The RFC listener is enabled and accessible to untrusted network sources.
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Check for DoS symptomsReview system logs, IGS trace files, and transaction ST03N for unusual spikes in IGS request failures or service crashes. Monitor for repeated service restarts or timeout errors related to graphics rendering.Affected if The IGS service is experiencing crashes, hangs, or is unable to process legitimate rendering requests.
A user is affected if their SAP IGS version is exactly 7.20, 7.20ext, 7.45, 7.49, or 7.53 AND the HTTP or RFC listener is network-accessible to unauthenticated attackers.
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-2018-2423. Additionally, implement network-level protections such as rate limiting, web application firewall rules, or restrict listener access to trusted networks to mitigate flood-based attacks.
- Consultation8.0 h
- Implementation16.0 h
- Testing8.0 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 $10,240.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-2423 — 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-2018-2423 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
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