CVE-2020-7659: reel through 0.6.1 allows Request Smuggling attacks due to incorrect Content-Length and Transfer encoding head

Q: How do I fix CVE-2020-7659?

reel: upgrade to newer than 0.6.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-7659 being exploited?

CVE-2020-7659 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-7659 affect?

CVE-2020-7659 affects reel. Severity is high (CVSS 7.5). 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, inva

Q: How urgent is CVE-2020-7659?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2020-7659 is a high-severity flaw (CVSS 7.5) affecting reel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-444
Published	2020-06-01
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: celluloid

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-01 13:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

celluloid reel UPGRADE

Affected: <= 0.6.1

Fixed in: newer than 0.6.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy reel || rpm -q reel || reel --version

2. UPGRADE to newer than 0.6.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade reel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade reel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7659?

reel: upgrade to newer than 0.6.1. Exact commands for each OS are on this page.

Is CVE-2020-7659 being exploited?

CVE-2020-7659 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7659 affect?

CVE-2020-7659 affects reel. Severity is high (CVSS 7.5). 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, inva

How urgent is CVE-2020-7659?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

References

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