An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0.

published 2022-09-26 4y ago modified 2026-09-10 last mo. also EUVD-2022-44557

cvss: 9.8; version 3.1, CNA
cisa kev: Exploited; added 2022-10-20, used in ransomware
epss: 95.5%; EPSS 95.5% chance of exploitation in 30 days, percentile 99.8%
public exploits: 1; Metasploit, plus a Nuclei check

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.

Patch / fix

cisa required action Apply updates per vendor instructions.

links 1

wiki.zimbra.com/wiki/Security_Center advisory

Is CVE-2022-41352 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Timeline

2022-06-28 First public exploit (Metasploit exploit/linux/http/zimbra_cpio_cve_2022_41352)
2022-09-26 Published
2022-10-07 CISA SSVC: exploitation active
2022-10-20 Added to CISA KEV
2022-11-10 CISA patch deadline

Known exploited

Added: 4y ago (2022-10-20)
Patch by: 2022-11-10 (3y ago)
Ransomware: Known to be used in ransomware campaigns
Required action: Apply updates per vendor instructions.
Vendor, product: Synacor, Zimbra Collaboration Suite (ZCS)
CISA name: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

BabLock ransomware gang

reported by group-ib.com

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

CISA SSVC

Exploitation: Active, exploited in the wild
Automatable: yes
Technical impact: total
Assessed: 4y ago (2022-10-07)

Exploit prediction

95.48% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Metasploit exploit/linux/http/zimbra_cpio_cve_2022_41352 TAR Path Traversal in Zimbra (CVE-2022-41352) metasploit exploit, excellent rank, 2022-06-28
Nuclei template Zimbra Collaboration - Unrestricted File Upload nuclei detection template
packetstormsecurity.com http://packetstormsecurity.com/files/169458/Zimbra-Collaboration-Suite-TAR-Path-Traversal.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

wiki.zimbra.com /wiki/Security_Center
patch, release-notes, vendor-advisory
packetstormsecurity.com /files/169458/Zimbra-Collaboration-Suite-TAR-Path-Traversal.html
exploit, third-party-advisory, vdb-entry
wiki.zimbra.com /wiki/Zimbra_Security_Advisories
vendor-advisory
forums.zimbra.org /viewtopic.php?t=71153&p=306532
mitigation, vendor-advisory
secpod.com /blog/unpatched-rce-bug-in-zimbra-collaboration-suite-exploited-in-wild/
third-party-advisory
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-41352
government-resource, us-government-resource

Sources

CVE List CVE-2022-41352
NVD CVE-2022-41352

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

json critical feed