CVE-2025-67725

Katalog CVE

CVSS 7.5 · High EPSS 0,56%

Kerentanan Uncontrolled Resource Consumption pada tornadoweb tornado. Skor CVSS 3.1 7.5 (High) menurut github.com.

Deskripsi (NVD)

Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single maliciously crafted HTTP request can block the server's event loop for an extended period, caused by the HTTPHeaders.add method. The function accumulates values using string concatenation when the same header name is repeated, causing a Denial of Service (DoS). Due to Python string immutability, each concatenation copies the entire string, resulting in O(n²) time complexity. The severity can vary from high if max_header_size has been increased from its default, to low if it has its default value of 64KB. This issue is fixed in version 6.5.3.

Rincian

Terbit di NVD

12 Desember 2025

Terakhir diubah

7 Oktober 2026

Status NVD

Analyzed

CVSS 3.1

7.5 (High), sumber github.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption

EPSS (30 hari)

0,56% peluang dieksploitasi; lebih tinggi dari 45,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/tornadoweb/tornado/security/advisories/GHSA-c98p-7wgm-6p64 advisory vendor
• https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd patch
• https://github.com/tornadoweb/tornado/releases/tag/v6.5.3 release notes