Security readout for executives and security teams
Plain-English summary
Tabs Mail Carrier 2.5.1 has a critical flaw in its SMTP email handling. A remote, unauthenticated attacker could potentially take control of the mail server by sending a specially crafted sender value. Public exploit information exists, but the provided sources do not show confirmed active exploitation.
Executive priority
Treat as urgent if Tabs Mail Carrier 2.5.1 is deployed, especially on internet-facing mail servers. The flaw is remotely reachable and may allow full server compromise. If the product is not used, priority is limited to confirming absence.
Technical view
CVE-2019-25646 is a CWE-787 buffer overflow in the MAIL FROM SMTP command of Tabs Mail Carrier 2.5.1. The CVSS 3.1 score is 9.8, with network attack vector, low complexity, no privileges, and no user interaction. Successful exploitation may allow arbitrary code execution.
Likely exposure
Organizations running Tabs Mail Carrier 2.5.1 with SMTP reachable on port 25 are the primary exposure group. Internet-facing mail services are highest risk. Exposure is unclear for other versions because the provided sources identify only version 2.5.1.
Exploitation context
ExploitDB and VulnCheck list public exploit information for this vulnerability. The source bundle states CISA KEV status is false, and no cited source confirms active exploitation in the wild.
Researcher notes
The public record identifies Tabs Mail Carrier 2.5.1 only. Evidence supports unauthenticated remote code execution through a MAIL FROM buffer overflow. No patch details are included in the provided sources, so remediation should be guided by vendor information or product removal/isolation decisions.
Mitigation direction
- Identify any Tabs Mail Carrier deployments and confirm version.
- Remove or isolate Tabs Mail Carrier 2.5.1 where feasible.
- Restrict SMTP access to trusted networks where business requirements allow.
- Check vendor guidance for updates, replacement, or supported remediation.
- Increase monitoring for suspicious SMTP traffic to affected hosts.
Validation and detection
- Inventory mail servers for Tabs Mail Carrier usage.
- Confirm whether version 2.5.1 is present.
- Determine whether SMTP port 25 is internet-accessible.
- Review logs for abnormal MAIL FROM activity or crashes.
- Verify compensating network controls are enforced.
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
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CWE-787: Exact CWE lookup
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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-2019-25646 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
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:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-46547CVE reference · exploit
- VulnCheck Advisory: Tabs Mail Carrier 2.5.1 Buffer Overflow via MAIL FROMCVE reference · third-party-advisory
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.