Ubuntu update for python-tornado

1) Allocation of Resources Without Limits or Throttling

EUVDB-ID: #VU109846

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 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

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

Update the affected package python-tornado to the latest version.

Vulnerable software versions

Ubuntu: 22.04 - 25.04

python-tornado (Ubuntu package): before 6.1.0-3ubuntu0.1~esm2

CPE2.3

• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:25.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:python-tornado_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-7547-1

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.