The most effective remediation is upgrading SmarterMail. SmarterTools resolved this vulnerability in . SmarterMail Build 6985 - Remote Code Execution - Exploit-DB
The refers to a critical vulnerability in SmarterTools SmarterMail (Version 16.x builds prior to 6985) that allows for unauthenticated Remote Code Execution (RCE) . This flaw stems from the insecure deserialization of untrusted data through specific .NET remoting endpoints . Technical Breakdown The vulnerability is formally tracked as CVE-2019-7214 .
Perform a comprehensive audit of all network VMs to identify any rogue or forgotten legacy mail servers, as unupdated VMs were a primary cause of breach.
The SmarterMail 6919 exploit targets a security flaw in how the application handles data serialization on port 17001. It is classified as a vulnerability.
SmarterTools patched CVE‑2019‑7214 in , along with three other related vulnerabilities [8†L4-L7]. However, because Build 6919 remains widely deployed in legacy environments—and because the public availability of exploit code makes it trivial to attack—many systems remain at risk years after the patch was released. smartermail 6919 exploit
By chaining these steps together, a remote, unauthenticated attacker can gain on the mail server, often within seconds.
The attacker doesn't need a login. Here is how the request looks under the hood:
For system administrators still running SmarterMail Build 6919 or any pre‑6985 build, the situation is urgent. These systems are not “legacy” in the sense of being merely outdated—they are that grant SYSTEM‑level access. The presence of Metasploit modules, public PoC code, and observed ransomware campaigns means that any Build 6919 server exposed to the internet is at imminent risk of compromise.
. This security flaw allows unauthenticated attackers to achieve Remote Code Execution (RCE) The most effective remediation is upgrading SmarterMail
A critical vulnerability chain affecting SmarterMail email servers—centered around Build 6919—has created one of the most significant email server security crises in recent enterprise history. The term “SmarterMail 6919 exploit” refers primarily to a severe that remained exploitable in SmarterMail versions prior to Build 6985. Build 6919 is the most famous affected version because it has become a common target for penetration testers, red teams, and malicious actors alike. Since its public disclosure, this vulnerability has evolved into a larger family of attacks that has fueled widespread ransomware campaigns, government‑level security alerts, and a series of rapid‑fire CVEs.
: If immediate patching is not possible, administrators should use a firewall to block all external traffic to TCP port 17001 .
The vulnerability stems from how SmarterMail handles remoting services. A common attack scenario involves using automated tools, such as those within the Metasploit framework , to target exposed ports.
The attacker scans an external IP footprint and discovers port 9998 (SmarterMail Webmail interface) and port 17001 (.NET Remoting port) open. Checking the source code of the login portal reveals the legacy deployment of Build 6919 . This flaw stems from the insecure deserialization of
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SmarterMail versions and builds < 6985 exposed three .NET remoting endpoints on TCP port 17001 :
Understanding the SmarterMail Build 6919 .NET Deserialization Vulnerability (CVE-2019-7214)
http://localhost:25/ --redirect-to-file