Cyber Resilience

CVE-2026-32661

Critical

Published: 13 May 2026

Published
13 May 2026
Modified
13 May 2026
KEV Added
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Patch
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CVSS Score v4 9.3 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0047 37.4th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-32661 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability. Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

run pop3wallpasswd with grdnwww user privilege.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Remote stack buffer overflow in web service enables arbitrary code execution via crafted request to public-facing application (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-38422Shared CWE-121
CVE-2025-11783Shared CWE-121
CVE-2025-54491Shared CWE-121
CVE-2024-39359Shared CWE-121
CVE-2026-42469Shared CWE-121
CVE-2020-37159Shared CWE-121
CVE-2024-39603Shared CWE-121
CVE-2024-36258Shared CWE-121
CVE-2024-51138Shared CWE-121
CVE-2025-69763Shared CWE-121

Affected Assets

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SaaS
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References