CVE intelligence and bounded remediation

CVE-2023-37491 — Sap Message Server security vulnerability

High CVSS 8.8

The ACL (Access Control List) of SAP Message Server - versions KERNEL 7.22, KERNEL 7.53, KERNEL 7.54, KERNEL 7.77, RNL64UC 7.22, RNL64UC 7.22EXT, RNL64UC 7.53, KRNL64NUC 7.22, KRNL64NUC 7.22EXT, can be bypassed in certain conditions, which may enable an authenticated malicious user to enter the network of the SAP systems served by the attacked SAP Message server. This may lead to unauthorized read and write of data as well as rendering the system unavailable.

Severity
High
CVSS
8.8 (3.1)
Published
2023-08-08
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-863

Affected products

  • sap / message_server / kernel_7.22
  • sap / message_server / kernel_7.53
  • sap / message_server / kernel_7.54
  • sap / message_server / kernel_7.77
  • sap / message_server / krnl64nuc_7.22
  • sap / message_server / krnl64nuc_7.22ex

Showing 6 representative product identities from 9 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

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Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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