{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2019-25646/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["cve-2019-25646","buffer-overflow","smtp","code-execution"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eTabs Mail Carrier 2.5.1 is susceptible to a critical buffer overflow vulnerability (CVE-2019-25646) affecting the MAIL FROM SMTP command. This flaw enables unauthenticated remote attackers to execute arbitrary code on the affected system. The vulnerability stems from insufficient bounds checking when processing the MAIL FROM parameter. By sending a specially crafted MAIL FROM command containing an oversized buffer, an attacker can overwrite the EIP register, hijack control flow, and ultimately execute a bind shell payload. This vulnerability can be exploited over the network via port 25 without requiring any prior authentication, making it easily exploitable. Successful exploitation grants the attacker complete control over the vulnerable system.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker connects to the target SMTP service on port 25.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a \u003ccode\u003eEHLO\u003c/code\u003e command to initiate communication with the SMTP server.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious \u003ccode\u003eMAIL FROM\u003c/code\u003e command with an oversized buffer.\u003c/li\u003e\n\u003cli\u003eThe attacker sends the crafted \u003ccode\u003eMAIL FROM\u003c/code\u003e command to the SMTP server.\u003c/li\u003e\n\u003cli\u003eThe oversized buffer overwrites the EIP register in memory.\u003c/li\u003e\n\u003cli\u003eThe overwritten EIP register points to the attacker-controlled shellcode.\u003c/li\u003e\n\u003cli\u003eThe shellcode executes, creating a bind shell on the target system.\u003c/li\u003e\n\u003cli\u003eThe attacker connects to the bind shell and executes arbitrary commands.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this buffer overflow vulnerability allows remote attackers to execute arbitrary code with the privileges of the Tabs Mail Carrier process. This can lead to complete system compromise, including data theft, modification, or destruction. Given the ease of exploitation and the severity of the impact, this vulnerability poses a significant risk to organizations using the affected software. There is no information on the number of victims or sectors targeted.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetecting SMTP MAIL FROM Buffer Overflow\u003c/code\u003e to your SIEM to identify exploitation attempts targeting this vulnerability based on oversized MAIL FROM commands.\u003c/li\u003e\n\u003cli\u003eMonitor network connections to port 25 for unusual traffic patterns, especially related to long MAIL FROM commands, to detect potential exploitation attempts (network_connection log source).\u003c/li\u003e\n\u003cli\u003eConsider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to inspect and filter SMTP traffic for malicious MAIL FROM commands.\u003c/li\u003e\n\u003cli\u003eUpgrade to a patched version of Tabs Mail Carrier that addresses this vulnerability as soon as it becomes available.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-24T12:16:07Z","date_published":"2026-03-24T12:16:07Z","id":"/briefs/2026-03-tabs-mail-carrier-overflow/","summary":"Tabs Mail Carrier 2.5.1 is vulnerable to a buffer overflow in the MAIL FROM SMTP command, allowing remote attackers to execute arbitrary code by sending a crafted MAIL FROM parameter with an oversized buffer to overwrite the EIP register and execute a bind shell payload via port 25.","title":"Tabs Mail Carrier 2.5.1 MAIL FROM Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-03-tabs-mail-carrier-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2019-25646","version":"https://jsonfeed.org/version/1.1"}