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Vulnerabilities

Vulnerability · CVE-2026-32661

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version).

Published May 13, 2026 · catalog updated Jun 17, 2026 · Canon Marketing Japan Inc. GUARDIANWALL MailSuite

Patch now

CVE-2026-32661 is in the CISA known-exploited catalog. Confirm Canon Marketing Japan Inc. GUARDIANWALL MailSuite against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.3
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.73%
Remediation
Remediation guidance
Affected products
vendor Canon Marketing Japan Inc. GUARDIANWALL MailSuite

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Canon Marketing Japan Inc. GUARDIANWALL MailSuiteversion unspecified

How to fix CVE-2026-32661

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-32661 is in the CISA known-exploited catalog. Confirm Canon Marketing Japan Inc. GUARDIANWALL MailSuite against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 0.73%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. May 13, 2026 · NIST NVD

    Detected

    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.

  3. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-32661

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-32661

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-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 ru

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-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 ru

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.