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[ CVE-2022-27924 · Published 21 Apr 2022 ]

Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

Exploited · CISA KEV CVSS 7.5 EPSS 94%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-08-04
  • Known to be used in ransomware campaigns
  • EPSS: 94% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance. These memcache commands becomes unescaped, causing an overwrite of arbitrary cached entries.

CISA: Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to inject memcache commands into a targeted instance which causes an overwrite of arbitrary cached entries.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 25 Aug 2022): Apply updates per vendor instructions.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References