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Exploited vulnerability · CISA KEV

Is CVE-2017-6327 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Symantec Messaging Gateway · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-6327, Symantec Messaging Gateway Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1545 days after it was published. It affects Symantec Messaging Gateway. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

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.

VendorSymantec (1 exploited CVE in KEV)
ProductSymantec Messaging Gateway
VulnerabilitySymantec Messaging Gateway Remote Code Execution Vulnerability
WeaknessCWE-20
Published11 Aug 2017
Added to KEV3 Nov 2021
Reported by (CNA)symantec

What to do

  1. Check whether you run it. Look for Symantec Messaging Gateway in your asset inventory, including appliances and cloud images. Stack check lists every exploited Symantec CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 11 Aug 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Symantec.

References

Questions

Is CVE-2017-6327 being exploited?

Yes. CISA added CVE-2017-6327 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-6327 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2017-6327?

Apply updates per vendor instructions. Check Symantec's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Symantec Messaging Gateway and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · act-now radar.

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