Cve20207796 Zimbra Collaboration Suite Full High Quality May 2026

CVE-2020-7796: Zimbra Collaboration Suite Vulnerability

4. Exploitation Status

Zimbra (Synacor) acted quickly to address this issue, releasing patches in late 2020. To secure a Zimbra Collaboration Suite instance against CVE-2020-7796, administrators must take the following steps:

Crafting a malicious link:

The attacker creates a URL targeting Zimbra’s webmail interface (typically on ports 80/443, 7071 for admin, or 8443 for mailbox). Example: cve20207796 zimbra collaboration suite full

  • Integrity Checks: Administrators should scan the Zimbra installation directories (specifically /opt/zimbra/jetty/webapps/zimbra/public/ and similar directories) for unexpected .jsp files or files with timestamps that do not align with the installation date.
  • Network Segmentation: Restrict access to the Zimbra administrative ports (ports 7071 and 9071) to trusted IP addresses only. While the exploit could work over standard ports in some cases, restricting admin access is a critical defense-in-depth strategy.

    • Malware Risks:

    Threat actors have been observed using this flaw to download malware, such as the Dogkild worm, which can disable security processes and alter system files. Remediation and Mitigations CVE-2020-7796: Zimbra Collaboration Suite Vulnerability 4

    Step 2: Crafting the Malicious Payload

    • Upgrade ZCS 8.8.15 to version 8.8.15 Patch 7 or later.
    • Upgrade ZCS 9.0 to version 9.0.0 Patch 10 or later.