Upstream information
Description
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.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 5.3 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | Low |
| Availability Impact | None |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 5.5 | 6.9 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Attack Requirements | None | None |
| Privileges Required | None | None |
| User Interaction | None | None |
| Vulnerable System Confidentiality Impact | None | None |
| Vulnerable System Integrity Impact | Low | Low |
| Vulnerable System Availability Impact | None | None |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
List of packages in QA
| Product(s) | Package(s) |
|---|---|
| SUSE Linux Enterprise Module for Development Tools 15 SP6 |
|
| SUSE Linux Enterprise Server 15 SP6 |
|
| SUSE Linux Enterprise Desktop 15 SP6 |
|
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 |
|
| SUSE Linux Enterprise High Performance Computing 15 SP6 |
|
| SUSE Linux Enterprise Module for Development Tools 15 SP7 |
|
| SUSE Linux Enterprise Server 15 SP7 |
|
| SUSE Linux Enterprise Desktop 15 SP7 |
|
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 |
|
| SUSE Linux Enterprise High Performance Computing 15 SP7 |
|
| SUSE Linux Enterprise Module for Package Hub 15 SP6 |
|
| SUSE Linux Enterprise Module for Package Hub 15 SP7 |
|
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP6 | netty-tcnative | In progress |
| SUSE Linux Enterprise Desktop 15 SP6 | netty3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP7 | netty-tcnative | In progress |
| SUSE Linux Enterprise Desktop 15 SP7 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | netty-tcnative | In progress |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | netty-tcnative | In progress |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP6 | netty-tcnative | In progress |
| SUSE Linux Enterprise Module for Development Tools 15 SP6 | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP7 | netty-tcnative | In progress |
| SUSE Linux Enterprise Module for Development Tools 15 SP7 | netty3 | Not affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | netty | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | netty | In progress |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | netty | In progress |
| SUSE Linux Enterprise Server 15 SP6 | netty-tcnative | In progress |
| SUSE Linux Enterprise Server 15 SP6 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | netty-tcnative | In progress |
| SUSE Linux Enterprise Server 15 SP7 | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | netty-tcnative | In progress |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | netty-tcnative | In progress |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | netty3 | Not affected |
| SUSE Manager Server Module 4.3 | netty | Affected |
| openSUSE Leap 15.6 | netty | Affected |
| openSUSE Leap 15.6 | netty3 | Not affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP5 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | netty3 | Not affected |
| SUSE Manager Proxy 4.3 | netty3 | Not affected |
| SUSE Manager Retail Branch Server 4.3 | netty3 | Not affected |
| SUSE Manager Server 4.3 | netty3 | Not affected |
| SUSE Manager Server LTS 4.3 | netty | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Enterprise Storage 7 | netty3 | Not affected |
| SUSE Enterprise Storage 7.1 | netty3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP5 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | netty3 | Not affected |
| SUSE Linux Enterprise Module for Development Tools 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | netty3 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | netty3 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | netty3 | Not affected |
| SUSE Manager Proxy 4.1 | netty3 | Not affected |
| SUSE Manager Proxy 4.2 | netty3 | Not affected |
| SUSE Manager Retail Branch Server 4.1 | netty3 | Not affected |
| SUSE Manager Retail Branch Server 4.2 | netty3 | Not affected |
| SUSE Manager Server 4.1 | netty3 | Not affected |
| SUSE Manager Server 4.2 | netty3 | Not affected |
| openSUSE Leap 15.3 | netty | Affected |
| openSUSE Leap 15.3 | netty3 | Not affected |
| openSUSE Leap 15.4 | netty | Affected |
| openSUSE Leap 15.4 | netty3 | Not affected |
| openSUSE Leap 15.5 | netty | Affected |
| openSUSE Leap 15.5 | netty3 | Not affected |
| Container Status | ||
| suse/manager/5.0/x86_64/server suse/multi-linux-manager/5.1/x86_64/server | netty | Affected |
SUSE Timeline for this CVE
CVE page created: Wed Oct 15 20:00:21 2025CVE page last modified: Fri Oct 17 14:33:00 2025