CVE-2026-73570

highpriority · act · 90OT risk · criticalKEV · exploitedEU KEV · CERT.PLEPSS 0.717 · 99 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 9 exploits · PoC

Likely / severe?

71.7% (99th) EPSS

CVSS 8.9 · high

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

enisa_euvd · fstec_bdu · cert_bund · ncsc_nl

added 2026-08-21remediate by 2026-08-24

required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

EU KEVflagged by CERT.PLreported 2026-08-18patched 2026-07-20

Improper sanitization of untrusted input during SNMP notification processing. Exploitation waves since the beginning of August 2026.

EPSS · scored 2026-10-22

Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.

cvss

Technical severity, 0–10. One row per scoring source.

8.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.9highAV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Lsecondary · FSTEC (BDU) RU

v3.18.9highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Lsecondary · ENISA EU

v3.18.9highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Lsecondary · cve@mitre.org USexploitability 2.2 · impact 6

v3.18.9highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L/E:Hsecondary · CVSS-BT (t0sche)

v3.18.9highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Lsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-78USCWE-78USCWE-78US

exploits (9)

Public proof-of-concept and weaponised exploit code.

0xBlackash/CVE-2026-73570CVE-2026-73570PoC · poc_in_github
BiuTrap/CVE-2026-73570CVE-2026-73570 PoCPoC · poc_in_github
HORKimhab/CVE-2026-73570CVE-2026-73570PoC · poc_in_github
INFOKOM-KI/Zimbra-CVE-2026-73570-RulesWazuh Rules for Detection Zimbra (CVE-2026-73570).PoC · poc_in_github
dahnutz/zimbra-cve-2026-73570-irDetection-first, evidence-preserving incident-response toolkit for Zimbra CVE-2026-73570. Includes read-only host checks, IOC feeds, triage, persistence, containment, and recovery guidance based on sanitized incident evidence.PoC · poc_in_github
gabrielunknown/CVE-2026-73570Zimbra SNMP Notification OS Command Injection — Unauthenticated RCE via SMTP exploit (Poc)PoC · poc_in_github

affected products (5)

Products and version ranges known to be affected.

Synacor Zimbra< 10.1.20cert_bundDE
Zimbra Collaboration0 → 10.1.20enisa_euvdEU
Zimbra Inc. Zimbra Collaboration Suite≤ 10.1.20fstec_bduRU
Synacor Zimbra Collaboration Suite≤ vers:unknown/*ncsc_nlNL
synacor zimbra collaboration suite< 10.1.20nvdUScpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0324Kwetsbaarheid verholpen in Zimbra Collaboration SuiteNL2026-08-23csaf · ncsc_nlNL
Zimbra heeft een kwetsbaarheid verholpen in Zimbra Collaboration Suite.
WID-SEC-W-2026-2429Synacor Zimbra: Mehrere SchwachstellenDeutsch2026-07-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Synacor Zimbra ausnutzen, um beliebigen Programmcode auszuführen, Cross-Site-Scripting-Angriffe durchzuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen und unbefugte Aktionen durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd fstec_bdu cert_bund ncsc_nl nvd NVD CVE.org MITRE

published 2026-08-13modified 2026-08-26

references (6)

External citations — patches, advisories, analysis.

https://wiki.zimbra.com/wiki/Security_Center enisa_euvd
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories enisa_euvd
https://moje.cert.pl/komunikaty/2026/145/aktywnie-wykorzystywana-podatnosc-w-zimbra-collaboration-suite/Third Party Advisorynvd
https://wiki.zimbra.com/wiki/Security_CenterRelease Notesnvd
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisorynvd
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-73570US Government Resourcenvd

scry

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