Microsoft catches hackers exploiting Zimbra bug before disclosure
Summary
Microsoft has detected malicious actors exploiting a vulnerability in Zimbra's Collaboration Suite. The attackers began probing this flaw weeks before it was publicly disclosed and assigned a CVE identifier.
IFF Assessment
FOE
This discovery indicates that threat actors are actively exploiting vulnerabilities before they are patched, posing a direct threat to organizations using the affected software.
Defender Context
This incident highlights the importance of proactive threat hunting and monitoring for unusual activity on critical infrastructure like mail servers. Defenders should be vigilant for signs of exploitation even for vulnerabilities that haven't been publicly disclosed or patched, as attackers are often ahead of the curve.