CISA KEV · Known exploitedMedium

CVE-2022-24682

Synacor Zimbra Collaborate Suite (ZCS)

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

CVSS: 6.1
EPSS: 30.9%
CISA KEV: Listed
Published: 2022.02.09

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability30.9%

Technical severityCVSS 6.1

Vulnerability overview

Affected product and versions

Product: Synacor Zimbra Collaborate Suite (ZCS)
Affected versions: >= 8.8.0 < 8.8.15, 8.8.15
Fixed versions: 8.8.15

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.03.11

1
Identify
Confirm that Synacor Zimbra Collaborate Suite (ZCS) and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE: CWE-116, CWE-79
KEV added: 2022.02.25
Ransomware use: 확인됨