CVE-2026-32661: Stack-based buffer overflow in Canon Marketing Japan Inc. GUARDIANWALL MailSuite (On-premises version)
Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version). If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd with grdnwww user privilege.
AI Analysis
Technical Summary
CVE-2026-32661 is a stack-based buffer overflow vulnerability in Canon Marketing Japan Inc.'s GUARDIANWALL MailSuite (on-premises versions 1.4.00 to 2.4.26) and the Mail Security Cloud SaaS version. The flaw arises when the product is configured to run the pop3wallpasswd process with grdnwww user privileges. A remote attacker can send a specially crafted request to the product's web service, triggering the overflow and potentially allowing arbitrary code execution. The vulnerability is rated critical with a CVSS 3.0 base score of 9.8, reflecting its ease of exploitation and severe impact on system confidentiality, integrity, and availability. As of the published date, no official patch or remediation level has been disclosed by the vendor.
Potential Impact
Successful exploitation of this vulnerability could allow a remote unauthenticated attacker to execute arbitrary code on the affected system with the privileges of the grdnwww user. This can lead to full compromise of the affected GUARDIANWALL MailSuite installation, impacting confidentiality, integrity, and availability of the system and potentially the broader network environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, organizations should consider restricting network access to the affected service and monitor for unusual activity related to the pop3wallpasswd process. Avoid configuring the product to run pop3wallpasswd with grdnwww user privileges if possible. Follow updates from Canon Marketing Japan Inc. for official patches or mitigations.
CVE-2026-32661: Stack-based buffer overflow in Canon Marketing Japan Inc. GUARDIANWALL MailSuite (On-premises version)
Description
Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version). If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd with grdnwww user privilege.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-32661 is a stack-based buffer overflow vulnerability in Canon Marketing Japan Inc.'s GUARDIANWALL MailSuite (on-premises versions 1.4.00 to 2.4.26) and the Mail Security Cloud SaaS version. The flaw arises when the product is configured to run the pop3wallpasswd process with grdnwww user privileges. A remote attacker can send a specially crafted request to the product's web service, triggering the overflow and potentially allowing arbitrary code execution. The vulnerability is rated critical with a CVSS 3.0 base score of 9.8, reflecting its ease of exploitation and severe impact on system confidentiality, integrity, and availability. As of the published date, no official patch or remediation level has been disclosed by the vendor.
Potential Impact
Successful exploitation of this vulnerability could allow a remote unauthenticated attacker to execute arbitrary code on the affected system with the privileges of the grdnwww user. This can lead to full compromise of the affected GUARDIANWALL MailSuite installation, impacting confidentiality, integrity, and availability of the system and potentially the broader network environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, organizations should consider restricting network access to the affected service and monitor for unusual activity related to the pop3wallpasswd process. Avoid configuring the product to run pop3wallpasswd with grdnwww user privileges if possible. Follow updates from Canon Marketing Japan Inc. for official patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- jpcert
- Date Reserved
- 2026-05-11T00:11:34.095Z
- Cvss Version
- 3.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0414f1cbff5d86106d95b6
Added to database: 5/13/2026, 6:06:41 AM
Last enriched: 5/13/2026, 6:21:33 AM
Last updated: 5/13/2026, 9:46:49 AM
Views: 7
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