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PatchSiren cyber security CVE debrief

CVE-2024-27443 Synacor CVE debrief

CVE-2024-27443 affects Synacor Zimbra Collaboration Suite (ZCS) and is listed in CISA's Known Exploited Vulnerabilities catalog. The CISA entry points to vendor security-fix releases for Zimbra 8.8.15 P46, 9.0.0 P39, and 10.0.7, and sets a mitigation deadline of 2025-06-09. Organizations running ZCS should prioritize remediation and confirm exposure as soon as possible.

Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-05-19
Original CVE updated
2025-05-19
Advisory published
2025-05-19
Advisory updated
2025-05-19

Who should care

Email and collaboration platform administrators, security operations teams, and vulnerability managers responsible for Synacor Zimbra Collaboration Suite (ZCS) deployments.

Technical summary

The supplied corpus identifies CVE-2024-27443 as a cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite (ZCS). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-05-19 and references vendor security-fix releases for 8.8.15 P46, 9.0.0 P39, and 10.0.7. The corpus does not provide a CVSS score or additional exploitation details.

Defensive priority

Urgent

Recommended defensive actions

  • Inventory all Synacor Zimbra Collaboration Suite (ZCS) instances across production, test, and externally reachable environments.
  • Apply the vendor security fixes referenced by CISA for the applicable ZCS release train: 8.8.15 P46, 9.0.0 P39, or 10.0.7.
  • If mitigations cannot be applied promptly, follow CISA's KEV guidance to mitigate per vendor instructions, follow BOD 22-01 for cloud services where applicable, or discontinue use if mitigations are unavailable.
  • Verify that remediation is complete on all exposed ZCS systems and that the vulnerable condition is no longer present.
  • Track closure against the CISA KEV due date of 2025-06-09 and document evidence of remediation.

Evidence notes

Source corpus and official links identify CVE-2024-27443 as a Zimbra Collaboration Suite XSS issue added to CISA KEV on 2025-05-19 with a mitigation due date of 2025-06-09. The CISA KEV source item references Synacor/Zimbra security-fix pages for 8.8.15 P46, 9.0.0 P39, and 10.0.7, plus the NVD detail page. The corpus does not supply a CVSS score, and ransomware-campaign use is marked Unknown.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27443 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27443

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-27443 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27443

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.