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VulnerabilityPublished Updated

CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) · OS Command Injection

Affects Synacor Zimbra Collaboration Suite (ZCS)Source CVE Database V5

0

Exploited in the wild · KEV due 24 Oct 2024 · public detection template (Nuclei) · 99% EPSS : upgrade to 10.1.1 or 10.0.9 now.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else. Other KEV due dates
EPSS
99.9% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 10.1.1, 10.0.9
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 2 Oct 2024

  2. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  3. Exploited in the wild: evidence found.

    Listed in CISA KEV 1 day after disclosure

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by MITRE Corporation

    , 31 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. , 1 day after disclosure

  4. KEV remediation due

    US federal deadline

    , 22 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Synacor Zimbra Collaboration Suite (ZCS) to 10.1.1 or 10.0.9.

Affected software

ProductAffectedFixed in
Synacor Zimbra Collaboration Suite (ZCS)Affected
  • <10.0.9
  • <10.1.1
Fixed in
  • 10.0.9
  • 10.1.1

Description

The postjournal service in Zimbra Collaboration (ZCS) before 8.8.15 Patch 46, 9 before 9.0.0 Patch 41, 10 before 10.0.9, and 10.1 before 10.1.1 sometimes allows unauthenticated users to execute commands.

References

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