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Critical

Memory Corruption in SAP Kernel RFC Handling for SAP NetWeaver and ABAP Platform

IdentifiersCVE-2026-27671CWE-121· Stack-based Buffer Overflow

CVE-2026-27671 affects the SAP Kernel used by the Application Server ABAP of SAP NetWeaver and ABAP Platform. The vulnerability is caused by improper RFC protocol validation. An unauthenticated attacker can send a crafted RFC request that triggers logical errors in memory management, resulting in memory corruption. SAP’s published context indicates the issue is reachable remotely over the network and does not require authentication or user interaction.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause high impact to confidentiality, integrity, and availability of the affected application. Because the flaw leads to memory corruption in the SAP Kernel’s RFC processing path, exploitation may enable severe compromise of the target system, including unauthorized access to sensitive data, modification of application state or data, and disruption or crash of the affected service.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure of the RFC interface to trusted hosts only, restrict network access with segmentation and firewall controls, and minimize direct exposure of affected SAP ABAP systems to untrusted networks. Monitor RFC traffic for malformed or unexpected requests and prioritize patching because the issue is remotely reachable without authentication. Specific vendor-supported mitigations beyond patching were not provided in the available content.

Remediation

Patch, then assume compromise.

Apply the SAP security fix referenced for CVE-2026-27671. The provided source material points to SAP Note 3717897 and SAP Security Patch Day guidance as the vendor remediation. Organizations should update the affected SAP Kernel used by Application Server ABAP on SAP NetWeaver and ABAP Platform to the corrected version supplied by SAP.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-27671
NVD
nvd.nist.gov/vuln/detail/CVE-2026-27671
MITRE CWE · CWE-121
Stack-based Buffer Overflow
me.sap.com
me.sap.com/notes/3717897
url.sap
url.sap/sapsecuritypatchday