CVE-2026-66767: CWE-191: Integer Underflow in SAP_SE SAP NetWeaver Application Server for ABAP and ABAP Platform
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 enable session hijacking of another user under narrow timing conditions. The vulnerability impacts confidentiality and integrity with high severity and has low impact on availability.
AI Analysis
Technical Summary
This vulnerability (CWE-191: Integer Underflow) in SAP NetWeaver Application Server for ABAP and ABAP Platform allows an unauthenticated attacker to trigger reprocessing of a buffered user request by sending a specially crafted packet. This reprocessing can lead to hijacking another user's session if the attacker exploits precise timing conditions. The CVSS 3.1 score is 7.7, reflecting high impact on confidentiality and integrity, and low impact on availability. No official patch or remediation level has been published yet. The affected versions are explicitly listed and include specific releases such as 7.22EXT, 7.53, 8.04, and others up to 9.20.
Potential Impact
Successful exploitation could lead to high confidentiality and integrity impact by allowing session hijacking, potentially granting unauthorized access to user sessions. Availability impact is low. There are no known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation guidance has been published by the vendor yet. Patch status is not yet confirmed — check the SAP advisory for current remediation guidance. Until a fix is available, monitor SAP security advisories for updates.
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 enable session hijacking of another user under narrow timing conditions. The vulnerability impacts confidentiality and integrity with high severity and has low impact on availability.
CVSS v3.1
Score 7.7high
Affected software
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: Integer Underflow) in SAP NetWeaver Application Server for ABAP and ABAP Platform allows an unauthenticated attacker to trigger reprocessing of a buffered user request by sending a specially crafted packet. This reprocessing can lead to hijacking another user's session if the attacker exploits precise timing conditions. The CVSS 3.1 score is 7.7, reflecting high impact on confidentiality and integrity, and low impact on availability. No official patch or remediation level has been published yet. The affected versions are explicitly listed and include specific releases such as 7.22EXT, 7.53, 8.04, and others up to 9.20.
Potential Impact
Successful exploitation could lead to high confidentiality and integrity impact by allowing session hijacking, potentially granting unauthorized access to user sessions. Availability impact is low. There are no known exploits in the wild at this time.
Mitigation Recommendations
No official patch or remediation guidance has been published by the vendor yet. Patch status is not yet confirmed — check the SAP advisory for current remediation guidance. Until a fix is available, monitor SAP security advisories for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- sap
- Date Reserved
- 2026-07-27T17:33:40.733Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9f5c5bacd9273b49b3db49
Added to database: 09/08/2026, 00:52:43 UTC
Last enriched: 09/08/2026, 01:07:26 UTC
Last updated: 09/08/2026, 03:15:46 UTC
Views: 6
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