Upstream information
Description
A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing "\n" characters with "\0".SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (Red Hat) | SUSE |
|---|---|---|
| Base Score | 6.5 | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | Low | Low |
| Availability Impact | Low | Low |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 6.9 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | None |
| Privileges Required | None |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | Low |
| Vulnerable System Availability Impact | Low |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
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Please note that this evaluation state might be work in progress, incomplete or outdated.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 High Performance Computing 12 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | stunnel | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | stunnel | Affected |
| SUSE Linux Enterprise Server 15 SP7 | stunnel | Affected |
| SUSE Linux Enterprise Server 16.0 | stunnel | Affected |
| SUSE Linux Enterprise Server 16.1 | stunnel | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | stunnel | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | stunnel | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | stunnel | Affected |
| openSUSE Leap 16.0 | stunnel | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 12 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | stunnel | Affected |
| SUSE Linux Enterprise Server 12 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | stunnel | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | stunnel | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | stunnel | Affected |
| SUSE Manager Proxy 4.3 | stunnel | Not affected |
| SUSE Manager Proxy LTS 4.3 | stunnel | Not affected |
| SUSE Manager Retail Branch Server 4.3 | stunnel | Not affected |
| SUSE Manager Retail Branch Server LTS 4.3 | stunnel | Not affected |
| SUSE Manager Server 4.3 | stunnel | Not affected |
| SUSE Manager Server LTS 4.3 | stunnel | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | stunnel | Not affected |
| SUSE CaaS Platform 4.0 | stunnel | Not affected |
| SUSE Enterprise Storage 6 | stunnel | Not affected |
| SUSE Enterprise Storage 7 | stunnel | Not affected |
| SUSE Enterprise Storage 7.1 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | stunnel | Affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT | stunnel | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP1-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP2-BCL | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP2-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP2-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP3-BCL | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP3-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12 SP4-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 12-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | stunnel | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server 15-LTSS | stunnel | Not affected |
| SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | stunnel | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | stunnel | Not affected |
| SUSE Manager Proxy 4.0 | stunnel | Not affected |
| SUSE Manager Proxy 4.1 | stunnel | Not affected |
| SUSE Manager Proxy 4.2 | stunnel | Not affected |
| SUSE Manager Retail Branch Server 4.0 | stunnel | Not affected |
| SUSE Manager Retail Branch Server 4.1 | stunnel | Not affected |
| SUSE Manager Retail Branch Server 4.2 | stunnel | Not affected |
| SUSE Manager Server 4.0 | stunnel | Not affected |
| SUSE Manager Server 4.1 | stunnel | Not affected |
| SUSE Manager Server 4.2 | stunnel | Not affected |
| SUSE OpenStack Cloud 7 | stunnel | Not affected |
| SUSE OpenStack Cloud 8 | stunnel | Not affected |
| SUSE OpenStack Cloud 9 | stunnel | Not affected |
| SUSE OpenStack Cloud Crowbar 8 | stunnel | Not affected |
| SUSE OpenStack Cloud Crowbar 9 | stunnel | Not affected |
| openSUSE Leap 15.3 | stunnel | Not affected |
| openSUSE Leap 15.4 | stunnel | Not affected |
| openSUSE Leap 15.5 | stunnel | Not affected |
| openSUSE Leap 15.6 | stunnel | Affected |
| Container Status | ||
| suse/stunnel | stunnel | Affected |
SUSE Timeline for this CVE
CVE page created: Fri Aug 7 12:51:04 2026CVE page last modified: Fri Aug 7 13:37:44 2026