CVE-2021-27629
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 EncPSetUnsupported() 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 confidenceA denial of service vulnerability in SAP NetWeaver ABAP Server's Enqueue Server component allows unauthenticated attackers to crash the system by sending specially crafted packets that trigger improper input validation failure in the EncPSetUnsupported() method, rendering the system 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 SAP NetWeaver ABAP kernel versionExecute transaction SM51 on the ABAP system or use the SAP kernel version check command (e.g., 'sapkernel -v' or check the 'exe' directory for kernel executable files) to obtain the installed kernel release and patch levelAffected if The kernel version matches one of the affected versions: 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, or krnl64nuc_7.22
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Confirm Enqueue Server is enabled and runningCheck if the Enqueue Server process (enqueue_server or enqserv) is active on the system using transaction SM37 or by checking running processes (e.g., 'ps -ef | grep enqueue')Affected if The Enqueue Server component is running and active on the ABAP system
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Verify network exposure of Enqueue ServerReview SAP profile parameters (特别是 ENQUE/server port settings in default.pfl and instance profiles) and check firewall rules to determine if the Enqueue Server port (typically 32## where ## is the instance number) is accessible from untrusted networksAffected if The Enqueue Server port is exposed to unauthenticated network attackers without proper network segmentation or access controls
A system is affected if it runs a vulnerable SAP NetWeaver ABAP kernel version AND has the Enqueue Server exposed to unauthenticated attackers on the network.
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 (refer to SAP Note for this CVE) to address the input validation flaw in the Enqueue Server; consider network segmentation to limit exposure to unauthenticated attackers until patch is applied.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27629 — 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-2021-27629 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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