Is CVE-2022-27924 in the CISA KEV catalog?

Yes. CVE-2022-27924 is on the CISA Known Exploited Vulnerabilities list, added 2022-08-04, and has known ransomware campaign use.

What is the CVSS severity of CVE-2022-27924?

CVE-2022-27924 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2022-27924?

CVE-2022-27924 has an EPSS score of 85.40% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2022-27924?

No published fix for CVE-2022-27924 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-08-25. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2022-27924

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

NVD

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.

CWE-74Injection

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-08-25

Known ransomware campaign use

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

85.40%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2022-08-25

Associated with ransomware campaigns

References

Vendor Advisory3

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-31.