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CVE-2022-27924 is a high-severity vulnerability in Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 that allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted ZCS instance. The flaw causes attacker-supplied memcache commands to be processed without proper escaping, enabling overwrite of arbitrary cached entries. In affected deployments, this can be leveraged to retrieve ZCS email account credentials in cleartext from cache without user interaction. The issue affects the application’s interaction with its caching layer rather than requiring prior authentication to the mail platform itself.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Synacor vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
CVE-2022-27924 is a specific vulnerability for which a detection script has been created and validated against both vulnerable and patched hosts.
A Zimbra Collaboration Suite vulnerability referenced as part of a Zimbra exploitation set associated with RedHotel activity (per CISA-referenced reporting in the content).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.