CommuniCrypt Mail <= 1.16 ANSMTP/AOSMTP ActiveX Control Buffer Overflow
Published Aug 21, 2025
8.6
HIGHCVSS 4.0
EPSS 1.13%
Description
CommuniCrypt Mail versions up to and including 1.16 contains a stack-based buffer overflow vulnerability in its ANSMTP.dll and AOSMTP.dll ActiveX controls, specifically within the AddAttachments() method. This method fails to properly validate the length of input strings, allowing data to exceed the bounds of a fixed-size stack buffer. When invoked with an overly long string, the control can corrupt adjacent memory structures, including exception handlers, leading to potential control flow disruption.
Affected products
-
- Version 0StatusaffectedConstraints<=1.16
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| CommuniCrypt Software | CommuniCrypt Mail | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Aug 22, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (7 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.13% (0.01130) | 65.20th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.05% (0.01055) | 59.84th | v5 (v2026.06.15) |
| May 7, 2026 | 52.33% (0.52327) | 97.94th | v4 (v2025.03.14) |
| Jan 17, 2026 | 49.00% (0.49003) | 97.67th | v4 (v2025.03.14) |
| Dec 21, 2025 | 57.97% (0.57969) | 98.08th | v4 (v2025.03.14) |
| Oct 8, 2025 | 51.82% (0.51824) | 97.74th | v4 (v2025.03.14) |
| Aug 22, 2025 | 0.06% (0.00062) | 19.53th | v4 (v2025.03.14) |
References (6)
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/browser/communicrypt_mail_activex.rb exploit
- https://softwarelode.com/4185/details-communicrypt-mail.html product
- https://www.broadcom.com/support/security-center/attacksignatures/detail?asid=24374 third-party-advisory
- https://www.exploit-db.com/exploits/12663 exploit
- https://www.fortiguard.com/encyclopedia/ips/23099 third-party-advisory
- https://www.vulncheck.com/advisories/communicrypt-mail-activex-control-buffer-overflow third-party-advisory
Change history (0)
No recorded changes yet.