CVE-2022-41352

CRITICAL9.8

CISA KEV

Published 2022-09-26 · Updated 2026-09-10 · Source cve@mitre.org

Summary

CVE-2022-41352 is a critical-severity (CVSS 9.8) vulnerability in Synacor Zimbra Collaboration Suite (ZCS). CISA added it to the Known Exploited Vulnerabilities catalog on October 20, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 10, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Synacor has 19 vulnerabilities in the KEV catalog, 6 of them linked to ransomware.

All 19 known-exploited Synacor vulnerabilities →

Description

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through amavis via a cpio loophole (extraction to /opt/zimbra/jetty/webapps/zimbra/public) that can lead to incorrect access to any other user accounts. Zimbra recommends pax over cpio. Also, pax is in the prerequisites of Zimbra on Ubuntu; however, pax is no longer part of a default Red Hat installation after RHEL 6 (or CentOS 6). Once pax is installed, amavis automatically prefers it over cpio.

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

CWE-22CWE-22

CISA Known-Exploited Vulnerability

Product: Synacor — Zimbra Collaboration Suite (ZCS)

Name: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Date added: 2022-10-20 · Due: 2022-11-10

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Synacor vulnerabilities

Most recently added to CISA KEV

CVE-2026-73570
Zimbra Collaboration Suite (ZCS) — Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability
added 2026-08-21
CVE-2025-48700
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
added 2026-04-20
CVE-2025-66376
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
added 2026-03-18
CVE-2020-7796
Zimbra Collaboration Suite — Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability
added 2026-02-17
CVE-2025-68645
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
added 2026-01-22
CVE-2025-27915
Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
added 2025-10-07

View all →

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