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This library is used by the Amavis virus scanner, within the ESG appliance, the experts said.
This group has been using the ACE flaw to drop new variants of SEASPY and SALTWATERmalware.
This is not the first time Barracudas ESG appliances were targeted by UNC4841,BleepingComputerreminds.
In May, the group used another zero-day vulnerability, CVE-2023-2868, as part of its cyber-espionage campaign.
Roughly a third of all targeted endpoints belonged to government agencies, Mandiant confirmed.
