CVE-2022-27924
HighExploitedPublic exploitZimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance.
Published Apr 20, 2022 · Updated Oct 4, 2026
Key Facts
Patch immediately- CVE-2022-27924 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Zimbra Collaboration Suite (Synacor).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 4, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 94% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (30-day exploit likelihood)
94%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-27924 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 4, 2022 | Aug 25, 2022 | Known |
| Industry KEV feed | Aug 4, 2022 | Aug 25, 2022 | Known |
| CIRCL KEV | Aug 4, 2022 | Aug 25, 2022 | Known |
| ENISA EUVD | Aug 4, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
56 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zimbra Collaboration SuiteSynacor | 8.8.15, 8.8.15-p1, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15 | n/a |
Timeline
Publicly disclosed
Apr 20, 2022
Added to CISA KEV
Aug 4, 2022
Added to Industry KEV feed
Aug 4, 2022
Added to CIRCL KEV
Aug 4, 2022
Added to ENISA EUVD
Aug 4, 2022
Last updated
Oct 4, 2026
Weakness Type
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2022/27xxx/CVE-2022-27924.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2022-27924
- advisoryhttps://wiki.zimbra.com/wiki/Security_Center
- advisoryhttps://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24
- advisoryhttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
FAQ
Common Questions.
Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance.
Affected: Zimbra Collaboration Suite (Synacor) versions 8.8.15, 8.8.15-p1, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 4, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on Aug 4, 2022 with a federal remediation due date of Aug 25, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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