Security readout for executives and security teams
Plain-English summary
Internet-facing Zimbra mail servers may allow an unauthenticated attacker to run operating-system commands. Exposure requires a version before 10.1.20, the optional zimbra-snmp package, and enabled SNMP notifications. Because exploitation is reported and CISA lists the CVE as known exploited, affected organizations should respond immediately.
Executive priority
Immediate. Identify affected mail servers, remediate them urgently, and investigate exposed systems for compromise. Active exploitation materially increases business risk, including mailbox data theft, system manipulation, and service disruption. Systems lacking the optional package or enabled notifications should still be documented as not presently exposed.
Technical view
Improper sanitization during SNMP notification processing permits command injection through specially crafted SMTP requests. Successful exploitation executes commands as the Zimbra user without authentication or user interaction. The CVSS 3.1 score is 8.9, with high confidentiality and integrity impact and limited availability impact.
Likely exposure
Exposure is limited to Zimbra Collaboration before 10.1.20 where zimbra-snmp is installed and SNMP notifications are enabled. Internet-reachable SMTP services meeting all three conditions are the highest concern. The supplied affected-version metadata is inconsistent, so organizations should confirm applicability through Zimbra guidance and direct configuration inventory.
Exploitation context
Active exploitation is supported by the CISA Known Exploited Vulnerabilities designation and the supplied CERT Polska advisory. The bundle does not describe campaign scale, attacker identity, indicators of compromise, or exploitation reliability. The CVSS vector records high attack complexity, but exploitation requires neither authentication nor user interaction.
Researcher notes
This is CWE-78 command injection with conditional exposure. The supplied record identifies the vulnerable boundary as versions before 10.1.20, but its structured affected entry lists version "0" with default status unaffected, creating ambiguity. Validate product applicability against current Zimbra advisories. No exploit mechanics, indicators, or campaign details are provided.
Mitigation direction
- Upgrade affected Zimbra Collaboration deployments to version 10.1.20 or later, following vendor guidance.
- If immediate upgrading is impossible, disable SNMP notifications or remove zimbra-snmp after assessing operational dependencies.
- Restrict unnecessary SMTP exposure while preserving required mail delivery.
- Review Zimbra security advisories for additional remediation or compromise-assessment guidance.
Validation and detection
- Inventory Zimbra versions and identify every deployment earlier than 10.1.20.
- Confirm whether zimbra-snmp is installed and SNMP notifications are enabled.
- Prioritize investigation of internet-reachable SMTP services meeting all exposure conditions.
- Review relevant system and mail activity for unexpected commands or processes executed as the Zimbra user.
- After remediation, confirm the installed version and verify unnecessary SNMP notification functionality remains disabled.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-73570 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.9 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L2.26mitreVulnerability scoring details
Base CVSS 3.1 score
8.9HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesCVE reference, mitre
- https://wiki.zimbra.com/wiki/Security_CenterCVE reference, mitre
- https://moje.cert.pl/komunikaty/2026/145/aktywnie-wykorzystywana-podatnosc-w-zimbra-collaboration-suite/CVE reference, CISA-ADP · third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-73570CVE reference, CISA-ADP · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.