Buffer overflow in Canon Marketing Japan Inc. Guardianwall Mail Security Cloud (Saas Version)
CVE-2026-32661
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.003
Affected products
- Canon Marketing Japan Inc. Guardianwall Mail Security Cloud (Saas Version) — versions versions before the maintenance on April 30, 2026
- Canon Marketing Japan Inc. Guardianwall Mailsuite (On-Premises Version) — versions Ver 1.4.00 to Ver 2.4.26
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-32661?
- CVE-2026-32661 is a critical-severity vulnerability in Canon Marketing Japan Inc. Guardianwall Mail Security Cloud (Saas Version), classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-05-13.
- How severe is CVE-2026-32661?
- Critical severity. CVSS v3 base score is 9.8 out of 10.