CVE-2021-27630
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 NetWeaver ABAP Server and ABAP Platform (Enqueue Server), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method EnqConvUniToSrvReq() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified.
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 confidenceDenial of service vulnerability in SAP NetWeaver ABAP Server's Enqueue Server component. An unauthenticated attacker can send a specially crafted packet that triggers improper input validation in the EnqConvUniToSrvReq() method, causing the system to crash and become unavailable.
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= kernel_7.22= kernel_7.49= kernel_7.53= kernel_7.73= kernel_7.77= kernel_7.81= kernel_7.82= kernel_7.83= kernel_8.04= krnl32nuc_7.22= krnl32nuc_7.22ext= krnl64nuc_7.22CVSS 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 SAP kernel versionExecute command 'sapkernel -V' or check the kernel version via SAP transaction SM51, or inspect the 'exe' directory for kernel executable filesAffected if kernel version matches any of: kernel_7.22, kernel_7.49, kernel_7.53, kernel_7.73, kernel_7.77, kernel_7.81, kernel_7.82, kernel_7.83, kernel_8.04, krnl32nuc_7.22, krnl32nuc_7.22ext, krnl64nuc_7.22
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Confirm Enqueue Server component is runningCheck if the Enqueue Server process (ENQ or enque_server) is active using transaction SM37 or by running 'ps -ef | grep -i enque' on the application serverAffected if Enqueue Server process is running and the kernel version is in the affected list
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Review system logs for EnqConvUniToSrvReq crashesExamine SAP system logs (transaction SM21) and kernel developer traces (dev_enque or dev_w0) for crash entries or error messages mentioning 'EnqConvUniToSrvReq' or ENQ failuresAffected if Recent crashes or ENQ-related errors are logged and kernel version is in the affected list
If the installed SAP kernel version matches any of the affected versions (7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, 8.04 or kernel variants 32nuc/64nuc) and the Enqueue Server component is active, the system is vulnerable to CVE-2021-27630.
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 SAP security patches for CVE-2021-27630 to address the input validation issue in the Enqueue Server kernel component.
- Consultation8.0 h
- Implementation12.0 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 $9,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27630 — 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-2021-27630 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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