CVE-2022-27924

Name: CVE-2022-27924
Creator: NVD / NIST
Published: 2022-04-21T00:15:08.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 84.59%

Last modified Jun 17, 2026

CVE-2022-27924 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 84.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

84.59%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Aug 25, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Synacor	Zimbra Collaboration Suite	8.8.15
Synacor	Zimbra Collaboration Suite	9.0.0

References

https://wiki.zimbra.com/wiki/Security_CenterVendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24Release Notes, Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://wiki.zimbra.com/wiki/Security_CenterVendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24Release Notes, Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-27924US Government Resource

Timeline

Published: Apr 21, 2022
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2022-27924?

How severe is CVE-2022-27924?

CVE-2022-27924 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 84.59% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2022-27924?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-27924?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST