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PatchSiren cyber security CVE debrief

CVE-2017-6327 Symantec CVE debrief

CVE-2017-6327 affects Symantec Messaging Gateway and is described by the source corpus as a remote code execution vulnerability. It is listed in CISA’s Known Exploited Vulnerabilities (KEV) catalog, which means CISA has identified it as known to be exploited in the wild. The supplied record dates place the CVE/KEV entry at 2021-11-03 for this debrief, and the KEV entry directs defenders to apply updates per vendor instructions.

Vendor
Symantec
Product
Symantec Messaging Gateway
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security teams responsible for Symantec Messaging Gateway, especially administrators of internet-facing or security-critical mail gateway deployments, should prioritize this CVE. Incident responders and vulnerability management teams should also track it because CISA has added it to the KEV catalog.

Technical summary

The source corpus identifies a remote code execution issue in Symantec Messaging Gateway. No CVSS score or detailed attack preconditions are provided in the supplied sources, but the KEV listing indicates active exploitation concerns. The official response guidance in the KEV entry is to apply updates per vendor instructions.

Defensive priority

High. KEV inclusion raises urgency beyond a routine vulnerability because it signals known exploitation and a defined remediation deadline in the supplied record.

Recommended defensive actions

  • Apply vendor-provided updates for Symantec Messaging Gateway as directed by the KEV entry.
  • Confirm whether any Symantec Messaging Gateway instances remain deployed, especially in exposed or business-critical environments.
  • Review asset inventories and patch status against the KEV due date in the supplied record (2022-05-03).
  • Monitor vendor and internal security advisories for product-specific remediation guidance and validation steps.
  • Prioritize exposure reduction and verification for any unpatched instances until remediation is complete.

Evidence notes

Source evidence is limited to the supplied CVE/KEV records and official links. CISA KEV metadata states the vulnerability is in Symantec Messaging Gateway, names it as a remote code execution issue, marks it as known exploited, and instructs defenders to apply updates per vendor instructions. The supplied timeline dates the CVE/KEV entry to 2021-11-03. No CVSS score, exploit chain details, or ransomware attribution are provided in the corpus; known ransomware campaign use is listed as Unknown.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-6327 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-6327

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2017-6327 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-6327

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.