Get Permission Exim, one of the most-used message transfer agents, has issued patches for 21 flaws that could put thousands of users at risk of attacks, researchers at security firm Qualys say. The vulnerabilities, collectively dubbed "21nails," include 11 local and 10 remote code vulnerabilities and affect all versions of Exim servers from 2004 onward, the Qualys report notes. Exim, which was informed by Qualys about the vulnerabilities in October 2020, released patches for the flaws Tuesday. "The current Exim versions - and likely older versions too - suffer from several exploitable vulnerabilities," Exim notes in an update to users. "Due to several internal reasons, it took more time than usual for the Exim development team to work on these reported issues in a timely manner."