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HIGH · CVSS 7.5 CISA Known Exploited Vulnerability

CVE-2022-27924

Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

Synacor Zimbra Collaboration Suite (ZCS)

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.

CVSS
7.5
HIGH
EPSS
93.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
21 Apr 2022
CWE-74

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 4 August 2022. US federal agencies were required to remediate it by 25 August 2022. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 93.9%, which is higher than 99.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Frequently asked questions

Is CVE-2022-27924 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2022-27924.

What does CVE-2022-27924 affect?

CVE-2022-27924 affects Synacor Zimbra Collaboration Suite (ZCS). 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.

How severe is CVE-2022-27924?

CVE-2022-27924 is rated HIGH with a CVSS base score of 7.5. EPSS puts the probability of exploitation in the next 30 days at 93.9%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 25 August 2022.

How should organisations respond to CVE-2022-27924?

Apply the vendor patch for Synacor Zimbra Collaboration Suite (ZCS) as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.