Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.8 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

88.26 %

Predictive Probability

Percentile Rank

99.8 th

Documented as more likely to be exploited than 99.8% of known CVEs.

Detection Date

Aug 11, 2022

Remediation Due

Sep 01, 2022

CISA Catalog Active

Threat Analysis

Synacor Zimbra Collaboration Suite (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

https://blog.zimbra.com/2022/08/authentication-bypass-in-mailboximportservlet-vulnerability/

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2022-37042