Exploited vulnerability · CISA KEV

Is CVE-2022-27925 exploited? Yes: in CISA KEV since 11 Aug 2022

Gociux · Synacor Zimbra Collaboration Suite (ZCS) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2022-27925, Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Aug 2022, 113 days after it was published. It is known to be used in ransomware campaigns. It affects Synacor Zimbra Collaboration Suite (ZCS). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 11 Aug 2022

ransomwareKnownused in campaigns

EPSStop 1%among the most likely CVEs to be exploited

severity7.2CVSS 3.1 · high

US federal due1 Sep 2022BOD 22-01 deadline

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.

Vendor	Synacor (19 exploited CVEs in KEV)
Product	Zimbra Collaboration Suite (ZCS)
Vulnerability	Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability
Weakness	CWE-22
Published	20 Apr 2022
Added to KEV	11 Aug 2022
Reported by (CNA)	mitre

What to do

Check whether you run it. Look for Zimbra Collaboration Suite (ZCS) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Synacor CVE at once.
Apply the fix. Apply updates per vendor instructions.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 20 Apr 2022.
Get told next time. Email alerts when CISA adds a CVE for Synacor.

Other exploited CVEs in Zimbra Collaboration Suite (ZCS)

CVE-2026-73570: Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability (21 Aug 2026)
CVE-2025-48700: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability (20 Apr 2026)
CVE-2025-66376: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability (18 Mar 2026)
CVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability (22 Jan 2026)
CVE-2025-27915: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability (7 Oct 2025)
CVE-2019-9621: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability (7 Jul 2025)

References

Questions

Is CVE-2022-27925 being exploited?

Yes. CISA added CVE-2022-27925 to the Known Exploited Vulnerabilities catalog on 11 Aug 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-27925 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2022-27925?

Apply updates per vendor instructions. Check Synacor's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Zimbra Collaboration Suite (ZCS) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in August 2022 · Synacor scorecard · act-now radar.

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