CVE-2023-54397

critical · 9

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.

CVSS

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EPSS (exploit prob.)

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EPSS percentile

2026-09-15

Published

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-444

References

https://github.com/tornadoweb/tornado/security/advisories/GHSA-qppv-j76h-2rpx
https://www.vulncheck.com/advisories/tornado-before-6.3.3-http-request-smuggling-via-content-length

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2023-54397