Multiple government-backed hacking groups are exploiting a recently-patched vulnerability in Microsoft Exchange email servers.
The exploitation attempts were first spotted by UK cyber-security firm Volexity on Friday and confirmed today to ZDNet by a source in the DOD.
Volexity did not share the names of the hacking groups exploiting this Exchange vulnerability. Volexity did not return a request for comment for additional details.
The DOD source described the hacking groups as “all the big players,” also declining to name groups or countries.