the issue is related to the Sophos AV engine. Particular messages can cause an internal Sophos error. The issue has been fixed in newer versions of Sophos. Since you are running on EoL version 6.1 you should upgrade to a supported version which will include an updated Sophos version including the fix. The latest AsyncOS version is 7.6.1 which has Sophos 4_84.
On December 8, FireEye reported that it had been compromised in a sophisticated supply chain attack: more specifically through the SolarWinds Orion IT monitoring and management software. The attackers leveraged business software updates in order to distr...
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Cisco Secure Endpoint (for...