{"id":"CVE-2026-73570","published":"2026-08-13T16:19:06Z","modified":"2026-08-24T13:19:17Z","title":"Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability","vendor":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"Zimbra Collaboration Suite (ZCS) before 10.1.20 contains an OS command injection flaw in SNMP notification processing, which arises when the optional zimbra-snmp package is installed and SNMP notifications are enabled. An unauthenticated remote attacker who can send specially crafted SMTP requests to the server may be able to execute arbitrary operating system commands as the Zimbra user, though the attack requires a high-complexity condition and the specific SNMP configuration described above.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:53:53Z"},"cvss":{"score":8.9,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L","provenance":"source","from":"NVD"},"epss":{"score":0.71663,"percentile":0.99421,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2026-08-21","dueDate":"2026-08-24","ransomware":false,"requiredAction":"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.","notes":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://blog.zimbra.com/2026/07/patch-release-update-zimbra-10-1-20/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-73570","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-08-17","exploitedFirstSeen":"2026-08-17","ransomware":false,"evidence":[{"url":"https://moje.cert.pl/komunikaty/2026/145/aktywnie-wykorzystywana-podatnosc-w-zimbra-collaboration-suite/","date":"2026-08-17"},{"url":"https://previdian.com/CVE-2026-73570","date":"2026-08-20"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-08-21"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-08-23&host_type=src&vulnerability=cve-2026-73570","date":"2026-08-23"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-08-24&host_type=src&vulnerability=cve-2026-73570","date":"2026-08-24"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-08-25&host_type=src&vulnerability=cve-2026-73570","date":"2026-08-25"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-08-26&host_type=src&vulnerability=cve-2026-73570","date":"2026-08-26"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-01&host_type=src&vulnerability=cve-2026-73570","date":"2026-09-01"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-02&host_type=src&vulnerability=cve-2026-73570","date":"2026-09-02"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-06&host_type=src&vulnerability=cve-2026-73570","date":"2026-09-06"}],"evidenceTotal":14,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"references":[{"url":"https://wiki.zimbra.com/wiki/Security_Center","tags":["Release Notes"]},{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","tags":["Vendor Advisory"]},{"url":"https://moje.cert.pl/komunikaty/2026/145/aktywnie-wykorzystywana-podatnosc-w-zimbra-collaboration-suite/","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-73570","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Unauthenticated network requests exploit a public-facing mail service","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"an unauthenticated attacker can send specially crafted SMTP requests","start":262,"end":330}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Arbitrary OS command execution is the direct impact","mappingType":"primary_impact","evidence":[{"from":"description","quote":"may result in execution of arbitrary operating system commands","start":336,"end":398}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-58069","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-58069","exploited":true,"exploitedSince":"2026-08-18","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":8,"skipped":1,"earliest":"2026-08-21","earliestUrl":"https://github.com/HORKimhab/CVE-2026-73570","repos":[{"name":"HORKimhab/CVE-2026-73570","url":"https://github.com/HORKimhab/CVE-2026-73570","stars":5,"created":"2026-08-21"},{"name":"jishino567/CVE-2026-73570","url":"https://github.com/jishino567/CVE-2026-73570","stars":4,"created":"2026-08-25"},{"name":"gabrielunknown/CVE-2026-73570","url":"https://github.com/gabrielunknown/CVE-2026-73570","stars":4,"created":"2026-08-26"},{"name":"dahnutz/zimbra-cve-2026-73570-ir","url":"https://github.com/dahnutz/zimbra-cve-2026-73570-ir","stars":2,"created":"2026-09-04"},{"name":"0xBlackash/CVE-2026-73570","url":"https://github.com/0xBlackash/CVE-2026-73570","stars":2,"created":"2026-09-30"}]},"nuclei":[{"id":"CVE-2026-73570","name":"Zimbra Collaboration Suite < 10.1.20 - OS Command Injection","severity":"high","path":"network/cves/2026/CVE-2026-73570.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2026/CVE-2026-73570.yaml"}],"first":{"date":"2026-08-21","source":"PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-73570"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-08-13","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73570","provenance":"source"},{"date":"2026-08-17","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://moje.cert.pl/komunikaty/2026/145/aktywnie-wykorzystywana-podatnosc-w-zimbra-collaboration-suite/","provenance":"source"},{"date":"2026-08-18","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-58069","provenance":"source"},{"date":"2026-08-21","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-73570","provenance":"source"},{"date":"2026-08-21","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"}],"speed":{"daysToPublicExploit":8,"firstExploitFrom":"PoC-in-GitHub","daysToKev":8},"priority":{"score":76.1,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 76 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.88,"detail":"percentile 0.9942"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"8 PoC-in-GitHub repos; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.23,"detail":"base score 8.9"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}