CVE-2023-54397
CVSS v3
7.5
HIGH
EPSS Score
0.4 %
exploit probability, as of 2026-09-28
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2026-09-15
- Last Modified
- 2026-09-17
Frequently asked questions
What is CVE-2023-54397?
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.
Is CVE-2023-54397 actively exploited?
Active exploitation of CVE-2023-54397 has not been confirmed. Its EPSS score was 0.4% on 2026-09-28, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2023-54397?
CVE-2023-54397 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2023-54397 affecting your environment?
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