Updated October 20, 2022. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Exploited CVEs / Synacor / CVE-2022-41352

CVE-2022-41352

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2022-11-10 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Zimbra Security Center, linked below.

Risk summary

CriticalCISA KEVRansomware

9.8

CVSS v3 base

95%

EPSS exploit probability

Critical

Severity

2022-10-20

Added to KEV

2022-11-10 (past due)

CISA due date

Actively exploited Synacor Zimbra Collaboration Suite (ZCS) vulnerability, Critical severity, CVSS v3 9.8. Added to the CISA KEV catalog 2022-10-20.

Senserva AI read on CVE-2022-41352 CISA required action Official fix for CVE-2022-41352 Admin questions #83 hottest CVE right now

Senserva AI Opinion for CVE-2022-41352

Zimbra Collaboration Suite processes email attachments through cpio in a way that lets an attacker upload arbitrary files and gain access to other user accounts, rated Critical at CVSS 9.8. The 95 percent EPSS score reflects sustained mass exploitation of Zimbra servers, which are internet-facing mail platforms by nature. CISA listed it in October 2022 while webshells were being planted through emailed archives.

Do this: Patch Zimbra now, install the pax package Zimbra requires, and sweep the server for webshells dropped via attachments.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2022-41352

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I run IT security. Facts for CVE-2022-41352, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2022-41352.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (morning and afternoon US Central)):
- CVE-2022-41352: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability
- Affected: Synacor Zimbra Collaboration Suite (ZCS)
- Severity: Critical, CVSS v3 9.8; EPSS 30-day exploitation probability 95%
- Added to CISA KEV: 2022-10-20; federal remediation due 2022-11-10
- Ransomware-linked: YES
- CISA required action: Apply updates per vendor instructions.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Full tracking and change history for CVE-2022-41352

Published: 2022-10-20
Last revised: 2022-10-20
Changes tracked: 2

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Senserva Watchevery change we have recorded for this one

What changed, and when

CVE-2022-41352 was linked to ransomware activity on 2026-09-10: that is the drop-everything signal.

Drawn by Senserva Vivid from the Senserva change record. Hover any point for its date and value.

2022-10-20 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 9.8; EPSS first scored at 95.5%
2026-09-10 CVSS 9.8 to 0.0; linked to ransomware activity; CVSS 0.0 to 9.8

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

CISA required action

Federal remediation due date: 2022-11-10 (past due).

Apply updates per vendor instructions.

Official fix for CVE-2022-41352

The authoritative fix and affected-version list are published by the vendor. Find the Zimbra Collaboration Suite (ZCS) advisory on Zimbra Security Center.

Zimbra Security Center CISA KEV entry

Common questions about CVE-2022-41352

Is CVE-2022-41352 actively exploited?

Yes. CVE-2022-41352 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-10-20, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 95%. CISA also reports it is known to be used in ransomware campaigns.

What is the CISA deadline and required action for CVE-2022-41352?

CISA set the federal remediation due date at 2022-11-10, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.

What fixes CVE-2022-41352?

The authoritative fix is in the vendor advisory: see Zimbra Security Center for the patched Zimbra Collaboration Suite (ZCS) versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2022-41352?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2022-41352's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (morning and afternoon US Central).

Scope and sources

More exploited Synacor CVEs: CVE-2026-73570 CVE-2025-48700 CVE-2025-66376 CVE-2020-7796 CVE-2025-68645 CVE-2025-27915 CVE-2019-9621 CVE-2024-27443
All Synacor exploited CVEs on one page: Synacor vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.