CVE-2020-35884: An issue was discovered in the tiny_http crate through 2020-06-16 for Rust

Q: How do I fix CVE-2020-35884?

tiny-http: upgrade to newer than 0.7.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-35884 being exploited?

CVE-2020-35884 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-2020-35884 affect?

CVE-2020-35884 affects tiny-http, fedora. Severity is medium (CVSS 6.5). An issue was discovered in the tiny_http crate through 2020-06-16 for Rust. HTTP Request smuggling can occur via a malformed Transfer-Encoding header.

Q: How urgent is CVE-2020-35884?

Priority 44/100. Remotely exploitable, no login, no user action

This month

MEDIUM 6.5REMOTEUPGRADEMITIGATE

CVE-2020-35884 is a medium-severity flaw (CVSS 6.5) affecting tiny-http, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the tiny_http crate through 2020-06-16 for Rust. HTTP Request smuggling can occur via a malformed Transfer-Encoding header.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-444
Published	2020-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · tiny-http project

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

Am I affected?

Timeline

2020-12-31 10:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

tiny-http project tiny-http UPGRADE

Affected: <= 0.7.0

Fixed in: newer than 0.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tiny-http || rpm -q tiny-http || tiny-http --version

2. UPGRADE to newer than 0.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tiny-http

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tiny-http

Note

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

fedoraproject fedora MITIGATE

Affected: 34 · 35

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2020-35884?

tiny-http: upgrade to newer than 0.7.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35884 being exploited?

CVE-2020-35884 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-2020-35884 affect?

CVE-2020-35884 affects tiny-http, fedora. Severity is medium (CVSS 6.5). An issue was discovered in the tiny_http crate through 2020-06-16 for Rust. HTTP Request smuggling can occur via a malformed Transfer-Encoding header.

How urgent is CVE-2020-35884?

Priority 44/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-16097 HIGH 7.5 MITIGATE tiny-http is a simple http server

References

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