#VU109846 Allocation of Resources Without Limits or Throttling in Tornado - CVE-2025-47287

Vulnerability identifier: #VU109846

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-47287

CWE-ID: CWE-770

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tornado
Server applications / Web servers

Vendor: Tornado

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to excessive logging in the multipart/form-data parser. A remote attacker can force the application to generate an extremely high volume of logs and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Tornado: 1.0 - 6.4.2

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External links
https://github.com/tornadoweb/tornado/commit/b39b892bf78fe8fea01dd45199aa88307e7162f3
https://github.com/tornadoweb/tornado/security/advisories/GHSA-7cx3-6m66-7c5m

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.