CVE-2017-6327: in the CISA KEV catalogue
Symantec Messaging Gateway Remote Code Execution Vulnerability. CISA added CVE-2017-6327 to the Known Exploited Vulnerabilities catalogue on 2021-11-03 with a default due date of 2022-05-03. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Symantec Messaging Gateway contains an unspecified vulnerability which can allow for remote code execution. With the ability to perform remote code execution, an attacker may also desire to perform privilege escalating actions. (CISA description)
- Vendor / product
- Symantec Symantec Messaging Gateway
- CWE
- CWE-20
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 36%, percentile 98 (scored 2026-11-03)
EPSS puts about 36 in 100 odds (36%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 98% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2017-6327 in the CISA KEV catalogue?
Yes. CISA added CVE-2017-6327 (Symantec Messaging Gateway Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2021-11-03. CISA's default due date for it is 2022-05-03.
Is CVE-2017-6327 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2017-6327. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2017-6327?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2017-6327