Threat Signal Report

RCE Vulnerability in Zimbra Collaboration Suite (CVE-2022-41352) Being Exploited in the Wild

description-logo Description

FortiGuard Labs is aware of reports that a vulnerability affecting Zimbra Collaboration Suite (CVE-2022-41352) is a newly reported zero-day and is being exploited in the wild. CVE-2022-41352 is a Remote Code Execution (RCE) vulnerability that allows an attacker to perform remote code execution on vulnerable servers.

Why is this Significant?

This is significant because CVE-2022-41352 is a remote code execution vulnerability which is a zero-day and is actively being exploited in the wild.

Zimbra Collaboration, formerly known as Zimbra Collaboration Suite, is a cloud-based email, calendaring, and groupware solution developed by Synacor and is widely used worldwide. According to its Web site, Zimbra is used in more than 140 countries and over 1,000 government and financial institutions.

What is CVE-2022-41352?

The vulnerability exists due to Amavis' (Zimbra's Anti-virus engine) usage of "cpio" to extract archives in emails and scan contents. By leveraging the vulnerability, an attacker can gain improper access to any other Zimbra user accounts, which can lead to remote code execution.

What is the CVSS Score?

CVE-2022-41352 has a CVSS rating of 9.8. Zimbra rates the vulnerability as "major".

How Widespread is this?

While we do not know how widespread this is, the first report of this vulnerability being exploited has been reported to be around the beginning of September 2022.

What Versions of Zimbra Collaboration Suite are Vulnerable to CVE-2022-41352?

Zimbra Collaboration Suite version 8.8.15 and 9.0 are vulnerable.

Has the Vendor Released a Patch for CVE-2022-41352?

Yes, the vendor released a patch on October 10, 2022.

What is the Status of Protection?

FortiGuard Labs released the following IPS signature for CVE-2022-41352:

  • Zimbra.Collaboration.Suite.cpio.Remote.Code.Execution (default action is set to "pass")

Any Suggested Mitigation?

As mitigation, Zimbra recommends installing the pax package, an utility for creating and extracting archive files, to Zimbra servers. For details, please refer to the Appendix for a link to "Security Update - make sure to install pax/spax".



Traffic Light Protocol

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Not for disclosure, restricted to participants only.
Sources may use TLP:RED when information cannot be effectively acted upon by additional parties, and could lead to impacts on a party's privacy, reputation, or operations if misused. Recipients may not share TLP:RED information with any parties outside of the specific exchange, meeting, or conversation in which it was originally disclosed. In the context of a meeting, for example, TLP:RED information is limited to those present at the meeting. In most circumstances, TLP:RED should be exchanged verbally or in person.


Limited disclosure, restricted to participants’ organizations.
Sources may use TLP:AMBER when information requires support to be effectively acted upon, yet carries risks to privacy, reputation, or operations if shared outside of the organizations involved. Recipients may only share TLP:AMBER information with members of their own organization, and with clients or customers who need to know the information to protect themselves or prevent further harm. Sources are at liberty to specify additional intended limits of the sharing: these must be adhered to.


Limited disclosure, restricted to the community.
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Disclosure is not limited.
Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction.