CVE-2023-54397

Public on 2026-09-15

Modified on 2026-09-18

Description

Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.

Severity

Medium

See what this means

CVSS v3 Base Score

5.4

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	python-tornado	Pending Fix
Amazon Linux 2023	python-tornado	Pending Fix
Amazon Linux 2027 Preview	python-tornado	Not Affected
Amazon Linux 2 - Core	python3-tornado	Pending Fix
Amazon Linux 2023	python3.13-tornado	Not Affected

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	5.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2023-54397 Mitre: CVE-2023-54397