Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| tornadoweb | tornado | affected |
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Tornadoweb | Tornado | — |
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4461-1 | python-tornado security update |
Debian DSA |
DSA-6195-1 | python-tornado security update |
Github GHSA |
GHSA-jhmp-mqwm-3gq8 | Tornado: Quadratic DoS via Crafted Multipart Parameters |
Ubuntu USN |
USN-7950-1 | Tornado vulnerabilities |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.574% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:* |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Tornadoweb
Tornadoweb tornado |
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| Vendors & Products |
Tornadoweb
Tornadoweb tornado |
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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| Metrics |
threat_severity
|
threat_severity
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| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters | |
| Weaknesses | CWE-400 CWE-834 |
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| References |
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| Metrics |
cvssV3_1
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