What is CVE-2017-6327?

CVE-2017-6327 is a high-severity vulnerability in Symantec Message Gateway, classified under Command Injection. CVSS score: 8.8/10. Published 2017-08-11.

How severe is CVE-2017-6327?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2017-6327 known to be exploited?

Yes. CVE-2017-6327 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.

RCE in Symantec Message Gateway

CVE-2017-6327

The Symantec Messaging Gateway before 10.6.3-267 can encounter an issue of remote code execution, which describes a situation whereby an individual may obtain the ability to execute commands remotely on a target machine or in a target process. In this type of occurrence, after gaining access to the system, the attacker may attempt to elevate their privileges.

Vulnerability class: Command Injection (OS Command Injection)

Published 2017-08-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.359 (98.5th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.359 · newest: 0.359 · change: 0.000

Affected products

Symantec Message Gateway
Symantec Corporation Messaging Gateway — versions All versions prior to version 10.6.3-267

Weakness classification (CWE)

CWE-77 — Command Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

seclists.org/fulldisclosure/2017/Aug/28 (mailing-list, Mailing List, Third Party Advisory)
www.exploit-db.com/exploits/42519/ (VDB Entry, Third Party Advisory, exploit)
www.securityfocus.com/bid/100135 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.symantec.com/security_response/securityupdates/detail.jsp (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-6327?: CVE-2017-6327 is a high-severity vulnerability in Symantec Message Gateway, classified under Command Injection. CVSS score: 8.8/10. Published 2017-08-11.
How severe is CVE-2017-6327?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2017-6327 known to be exploited?: Yes. CVE-2017-6327 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.