CVE-2020-5236

Katalog CVE

CVSS 6.5 · Medium EPSS 2,4%

Kerentanan Uncontrolled Resource Consumption pada agendaless waitress. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like "Bad-header: xxxxxxxxxxxxxxx\x10" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible.

Rincian

Terbit di NVD

4 Februari 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

6.5 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption

EPSS (30 hari)

2,4% peluang dieksploitasi; lebih tinggi dari 83,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f patch · advisory pihak ketiga
• https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc advisory pihak ketiga