What is CVE-2020-7659?

CVE-2020-7659 is a high-severity vulnerability in Celluloid Reel, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2020-06-01.

How severe is CVE-2020-7659?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Celluloid Reel

CVE-2020-7659

reel through 0.6.1 allows Request Smuggling attacks due to incorrect Content-Length and Transfer encoding header parsing. It is possible to conduct HTTP request smuggling attacks by sending the Content-Length header twice. Furthermore, invalid Transfer Encoding headers were found to be parsed as valid which could be leveraged for TE:CL smuggling attacks. Note: This project is deprecated, and is not maintained any more.

Vulnerability class: HTTP Request Smuggling

Published 2020-06-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Celluloid Reel
Reel — versions All versions including 0.6.1

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

snyk.io/vuln/SNYK-RUBY-REEL-569135 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-7659?: CVE-2020-7659 is a high-severity vulnerability in Celluloid Reel, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2020-06-01.
How severe is CVE-2020-7659?: High severity. CVSS v3 base score is 7.5 out of 10.