Upstream information
Description
Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 7.5 | 7.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 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 | None | None |
| Availability Impact | High | High |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 8.7 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 | None |
| Vulnerable System Availability Impact | High |
| 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Please note that this evaluation state might be work in progress, incomplete or outdated.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 Desktop 15 SP6 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | python-tornado6 | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | python-tornado6 | Affected |
| SUSE Linux Enterprise Micro 5.2 | python-tornado | Affected |
| SUSE Linux Enterprise Micro 5.3 | python-tornado | Affected |
| SUSE Linux Enterprise Micro 5.4 | python-tornado | Affected |
| SUSE Linux Enterprise Micro 5.5 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-tornado | Not affected |
| SUSE Linux Enterprise Module for Python 3 15 SP6 | python-tornado6 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-tornado | Not affected |
| SUSE Linux Enterprise Module for Python 3 15 SP7 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP6 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP7 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | python-tornado6 | Affected |
| SUSE Linux Micro 6.0 | python-tornado | Not affected |
| SUSE Linux Micro 6.0 | python-tornado6 | Affected |
| SUSE Linux Micro 6.1 | python-tornado | Not affected |
| SUSE Linux Micro 6.1 | python-tornado6 | Affected |
| openSUSE Leap 15.6 | python-tornado | Not affected |
| openSUSE Leap 15.6 | python-tornado6 | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | python-tornado6 | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP4 | python-tornado6 | Affected |
| SUSE Linux Enterprise Module for Python 3 15 SP5 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP4 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP5 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP5 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | python-tornado6 | Affected |
| SUSE Manager Proxy 4.3 | python-tornado | Affected |
| SUSE Manager Proxy 4.3 | python-tornado6 | Affected |
| SUSE Manager Proxy LTS 4.3 | python-tornado | Affected |
| SUSE Manager Retail Branch Server 4.3 | python-tornado | Affected |
| SUSE Manager Retail Branch Server 4.3 | python-tornado6 | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | python-tornado | Affected |
| SUSE Manager Server 4.3 | python-tornado | Affected |
| SUSE Manager Server 4.3 | python-tornado6 | Affected |
| SUSE Manager Server LTS 4.3 | python-tornado | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 4.0 | python-tornado | Affected |
| SUSE Enterprise Storage 6 | python-tornado | Affected |
| SUSE Enterprise Storage 7 | python-tornado | Affected |
| SUSE Enterprise Storage 7.1 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | python-tornado6 | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | python-tornado | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | python-tornado6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | python-tornado | Affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise Module for Python 2 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | python-tornado | Affected |
| SUSE Linux Enterprise Server 15-LTSS | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | python-tornado6 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | python-tornado | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | python-tornado6 | Affected |
| SUSE Manager Proxy 4.0 | python-tornado | Affected |
| SUSE Manager Proxy 4.1 | python-tornado | Affected |
| SUSE Manager Proxy 4.2 | python-tornado | Affected |
| SUSE Manager Retail Branch Server 4.0 | python-tornado | Affected |
| SUSE Manager Retail Branch Server 4.1 | python-tornado | Affected |
| SUSE Manager Retail Branch Server 4.2 | python-tornado | Affected |
| SUSE Manager Server 4.0 | python-tornado | Affected |
| SUSE Manager Server 4.1 | python-tornado | Affected |
| SUSE Manager Server 4.2 | python-tornado | Affected |
| openSUSE Leap 15.3 | python-tornado | Affected |
| openSUSE Leap 15.4 | python-tornado | Affected |
| openSUSE Leap 15.4 | python-tornado6 | Affected |
| openSUSE Leap 15.5 | python-tornado | Affected |
| openSUSE Leap 15.5 | python-tornado6 | Affected |
| openSUSE Leap Micro 5.2 | python-tornado | Affected |
| openSUSE Leap Micro 5.3 | python-tornado | Affected |
| openSUSE Leap Micro 5.4 | python-tornado | Affected |
| openSUSE Leap Micro 5.5 | python-tornado | Affected |
SUSE Timeline for this CVE
CVE page created: Fri Dec 12 10:00:18 2025CVE page last modified: Fri Dec 12 20:26:37 2025