CVE-2018-6221
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.
Does this matter?
A public exploit is published in Exploit-DB (verified) and the impact is high, while EPSS rates exploitation at 6.1%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use.
Description
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.
- CVSS 3.0
- 8.1 HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 6.09% probability · 93th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 22 February 2018
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- trendmicro/email encryption gateway
- Source
- security@trendmicro.com
EPSS moved from 4.9% on 21 September 2026 to 6.1% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://success.trendmicro.com/solution/1119349Patch, Vendor Advisory
- https://www.coresecurity.com/advisories/trend-micro-email-encryption-gateway-multiple-vulnerabilitiesExploit, Technical Description, Third Party Advisory
- https://www.exploit-db.com/exploits/44166/Exploit, Third Party Advisory, VDB Entry
- https://success.trendmicro.com/solution/1119349Patch, Vendor Advisory
- https://www.coresecurity.com/advisories/trend-micro-email-encryption-gateway-multiple-vulnerabilitiesExploit, Technical Description, Third Party Advisory
- https://www.exploit-db.com/exploits/44166/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.