CVE-2018-6221
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could...
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.
- Record
CVE-2018-6221- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 9.3 High
AV:N/AC:M/Au:N/C:C/I:C/A:C - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.
- Record
CVE-2018-6221- Updated
- 2026-11-02
EUVDEUVD-2018-17982 No score
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.
- Record
EUVD-2018-17982- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v5jx-63r2-pgwj
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could...
An unvalidated software update vulnerability in Trend Micro Email Encryption Gateway 5.5 could allow a man-in-the-middle attacker to tamper with an update file and inject their own.
- Record
GHSA-v5jx-63r2-pgwj- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Trend Micro Email Encryption Gateway 5.5 (Build 1111.00) - Multiple Vulnerabilities | 2018-02-22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-6221 is a high vulnerability (CVSS 8.1) in Trend Micro Email Encryption Gateway, published March 15, 2018. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 6.09%, the 93rd percentile. No source names a fixed version.