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Netweaver As AbapApplication · Sap

CVE-2021-27628

HIGH · 7.5 CVSS v3.1 Published 2021-06-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
SAP NetWeaver ABAP Server and ABAP Platform (Dispatcher), versions - KRNL32NUC - 7.22,7.22EXT, KRNL32UC - 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 - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83, 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 DpRTmPrepareReq() 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 confidence

This is a denial of service vulnerability in SAP NetWeaver ABAP Server's Dispatcher component. An unauthenticated attacker can send a specially crafted packet over the network that triggers improper input validation in the DpRTmPrepareReq() method, causing the ABAP system to crash and become unavailable. No data exfiltration or modification is possible - the impact is purely availability disruption.

MitigationApply the relevant SAP security patch for this vulnerability. SAP has released corrections addressing improper input validation in the DpRTmPrepareReq() method in the affected kernel versions. Organizations should prioritize patching given the CVSS 7.5 severity and unauthenticated attack vector.

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
Netweaver As AbapApplication
Affected:= 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= krnl32uc_7.22

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm SAP NetWeaver ABAP is running
    Check if the disp+work process is running on the server: ps -ef | grep disp+work or check SAP transaction SM51 to view system instances
    Affected if disp+work process is running and the system is exposed to network
  2. Identify the SAP kernel version
    Execute 'disp+work -version' from the kernel directory (typically /usr/sap/<SID>/SYS/exe/run/) or use SAP transaction SM51 and click the Release Notes button
    Affected if Kernel version matches one of: 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, 8.04, or kernel variants krnl32nuc_7.22, krnl32nuc_7.22ext, krnl32uc_7.22
  3. Check if Dispatcher is network accessible
    Verify that ports used by the Dispatcher (typically 32<SID> and 33<SID> or 3600+ for message server) are exposed to untrusted networks. Use netstat or ss commands to list open ports and validate firewall rules
    Affected if Dispatcher ports are reachable from untrusted network segments
  4. Check kernel patch status
    Review SAP kernel patch notes or check the kernel binary timestamps in /usr/sap/<SID>/SYS/exe/run/ against the dates of the SAP security patch for CVE-2021-27628
    Affected if Kernel binaries have not been patched after the security note release date for this CVE

You are affected if your system runs SAP NetWeaver ABAP with a kernel version matching the affected list and the Dispatcher component is network-accessible to unauthenticated users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the relevant SAP security patch for this vulnerability. SAP has released corrections addressing improper input validation in the DpRTmPrepareReq() method in the affected kernel versions. Organizations should prioritize patching given the CVSS 7.5 severity and unauthenticated attack vector.

Fix this in Netweaver As Abap Scoped from the published advisory
  • Consultation6.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
24.0 hours of engineering $4,260
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-27628 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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