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Security Digest · Vulnerability record · Known exploited

CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability

Exploited in the wild (CISA KEV). 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.

CISA KEV · added 2024-10-03 CVSS 10.0 Critical EPSS 99.9% · p100.0

Updated By erroneo.us Security Desk11 references Seen in the digest for Oct 3, 2024

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

  • Yes, if you run Synacor Zimbra Collaboration Suite (ZCS). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-10-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-10-24; treat that as the outer limit, not the target.
  • EPSS 99.9%, percentile 100.0: FIRST’s model estimates a 99.9% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
  • Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

What it is

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.

CISA’s summary

Synacor Zimbra Collaboration Suite (ZCS) contains an unspecified vulnerability in the postjournal service that may allow an unauthenticated user to execute commands.

Weakness type: CWE-78, CWE-284.

Product: Synacor Zimbra Collaboration Suite (ZCS) · Assigned by: mitre · Published: 2024-10-02

Affected and fixed versions

VendorProductAffected versions (per CVE record)
n/an/asee vendor advisory

Severity scores

Scored byCVSSScoreVector
mitre3.110 CriticalCVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N
  • Attack complexity: low
  • Attack vector: network (remotely reachable)
  • Privileges required: none (no login)
  • Scope: changed (can affect other components)
  • User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

  • CISA KEV: added 2024-10-03; federal due date 2024-10-24. Known ransomware use: Unknown.
  • CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  • CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
  • FIRST EPSS (model of 2026-10-21): 99.91% probability of exploitation activity in the next 30 days; percentile 100.0.

Timeline

  • — CVE record published by mitre
  • — Added to CISA’s Known Exploited Vulnerabilities catalog
  • — CISA remediation deadline for US federal agencies
  • — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

  1. Listed in CISA KEV notes (wiki.zimbra.com) wiki.zimbra.com

Vulnerability records

  1. CVE.org record CVE-2024-45519 cve.org
  2. NVD entry CVE-2024-45519 nvd.nist.gov

Government

  1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

  1. wiki.zimbra.com wiki.zimbra.com
  2. wiki.zimbra.com wiki.zimbra.com
  3. wiki.zimbra.com wiki.zimbra.com
  4. wiki.zimbra.com wiki.zimbra.com
  5. wiki.zimbra.com wiki.zimbra.com
  6. wiki.zimbra.com wiki.zimbra.com
  7. blog.projectdiscovery.io blog.projectdiscovery.io

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