CVE-2026-32661 PUBLISHED

Assigner: jpcert
Reserved: 11.05.2026 Published: 13.05.2026 Updated: 13.05.2026

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.

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Canon Marketing Japan Inc.
Product	GUARDIANWALL MailSuite (On-premises version)
Versions	Version Ver 1.4.00 to Ver 2.4.26 is affected

Vendor	Canon Marketing Japan Inc.
Product	GUARDIANWALL Mail Security Cloud (SaaS version)
Versions	Version versions before the maintenance on April 30 is affected Version 2026 is affected

References

https://jvn.jp/en/jp/JVN35567473/

CVE-2026-32661 PUBLISHED

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Product Status

References

Problem Types