Buffer Overflow Vulnerability in Tabs Mail Carrier by Tabs
CVE-2019-25646

9.3CRITICAL

Key Information:

Vendor

Tabs

Status
Mail Carrier
Vendor
CVE Published:
24 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25646?

Tabs Mail Carrier version 2.5.1 is susceptible to a buffer overflow vulnerability that arises from the MAIL FROM SMTP command. By sending a specially crafted MAIL FROM parameter, remote attackers could gain control of the affected system. This is accomplished through connecting to the SMTP service on port 25 and providing an oversized buffer, which allows the attacker to overwrite the instruction pointer (EIP register). Such exploitation could lead to arbitrary code execution, including the capability to deploy a bind shell.

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Affected Version(s)

Mail Carrier 2.5.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25646 - Proof of Concept

References

https://www.exploit-db.com/exploits/46547
exploit
https://www.vulncheck.com/advisories/tabs-mail-carrier-bu...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joseph McDonagh
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