CVE-2026-66767: CWE-191: Integer Underflow in SAP_SE SAP NetWeaver Application Server for ABAP and ABAP Platform
Description
CVE-2026-66767 is an integer underflow vulnerability in SAP NetWeaver Application Server for ABAP and ABAP Platform. It allows an unauthenticated attacker to send a specially crafted packet that causes reprocessing of a previously buffered user request. This can potentially lead to session hijacking under narrow timing conditions. The vulnerability impacts confidentiality and integrity with high severity and has a low impact on availability.
CVSS v3.1
Score 7.7high
Affected software
SAP_SE
SAP NetWeaver Application Server for ABAP and ABAP Platform
pkg:github/sap_se/SAP-NetWeaver-Application-Server-for-ABAP-and-ABAP-PlatformRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-191) in SAP NetWeaver Application Server for ABAP and ABAP Platform involves an integer underflow that enables an unauthenticated user to trigger reprocessing of a buffered user request by sending a specially crafted packet. This flaw may allow the attacker to hijack another user's session if timing conditions are met. The CVSS v3.1 score is 7.7, indicating high severity with network attack vector, high attack complexity, no privileges required, no user interaction, and impacts confidentiality and integrity highly, with low availability impact.
Potential Impact
Successful exploitation could result in high confidentiality and integrity impact by potentially hijacking another user's session. Availability impact is low. There are no known exploits in the wild at this time.
Mitigation Recommendations
No explicit patch or remediation information is provided in the vendor advisory or input data. Patch status is not yet confirmed — check the SAP advisory for current remediation guidance. Due to the high attack complexity and narrow timing conditions, immediate exploitation risk may be limited, but monitoring SAP advisories for patches is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- sap
- Date Reserved
- 2026-07-27T17:33:40.733Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9f5c5bacd9273b49b3db49
Added to database: 09/08/2026, 00:52:43 UTC
Last enriched: 09/16/2026, 02:50:50 UTC
Last updated: 10/22/2026, 01:15:25 UTC
Views: 112
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