Bug 2404232 (CVE-2025-59419)

Summary: CVE-2025-59419 io.netty/netty-codec-smtp: Netty netty-codec-smtp SMTP Command Injection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aschwart, asoldano, ataylor, bbaranow, bmaxwell, boliveir, brian.stansberry, ccranfor, chfoley, darran.lofthouse, dhanak, dkreling, dosoudil, drosa, fjuma, fmariani, gmalinko, ibek, istudens, ivassile, iweiss, janstey, jcantril, jpechane, jrokos, jscholz, kverlaen, mnovotny, mosmerov, mposolda, msochure, msvehla, nwallace, pdelbell, pesilva, pjindal, pmackay, rmartinc, rojacob, rstancel, rstepani, sausingh, smaestri, ssilvert, sthorger, swoodman, tcunning, tom.jenkinson, vmuzikar, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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An SMTP command injection flaw has been discovered in the SMTP codec in Netty. The vulnerability exists in io.netty.handler.codec.smtp.DefaultSmtpRequest, where parameters are directly concatenated into the SMTP command string without sanitization. When methods such as SmtpRequests.rcpt(recipient) are called with a malicious string containing CRLF sequences, attackers can inject arbitrary SMTP commands. Because the injected commands are sent from the server's trusted IP address, resulting emails will likely pass SPF and DKIM authentication checks, making them appear legitimate. This allows remote attackers who can control SMTP command parameters (such as email recipients) to forge arbitrary emails from the trusted server.
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Description OSIDB Bzimport 2025-10-15 16:01:54 UTC 
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.128.Final and 4.2.7.Final, the SMTP codec in Netty contains an SMTP command injection vulnerability due to insufficient input validation for Carriage Return (\r) and Line Feed (\n) characters in user-supplied parameters. The vulnerability exists in io.netty.handler.codec.smtp.DefaultSmtpRequest, where parameters are directly concatenated into the SMTP command string without sanitization. When methods such as SmtpRequests.rcpt(recipient) are called with a malicious string containing CRLF sequences, attackers can inject arbitrary SMTP commands. Because the injected commands are sent from the server's trusted IP address, resulting emails will likely pass SPF and DKIM authentication checks, making them appear legitimate. This allows remote attackers who can control SMTP command parameters (such as email recipients) to forge arbitrary emails from the trusted server, potentially impersonating executives and forging high-stakes corporate communications. This issue has been patched in versions 4.1.129.Final and 4.2.8.Final. No known workarounds exist.