CVE-2020-35678: Autobahn|Python before 20.12.3 allows redirect header injection.

Q: How do I fix CVE-2020-35678?

autobahn: upgrade to 20.12.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-35678 being exploited?

CVE-2020-35678 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-2020-35678 affect?

CVE-2020-35678 affects autobahn. Severity is medium (CVSS 6.1). Autobahn|Python before 20.12.3 allows redirect header injection.

Q: How urgent is CVE-2020-35678?

Priority 40/100. No elevated risk signals yet.

This month

MEDIUM 6.1UPGRADE

CVE-2020-35678 is a medium-severity flaw (CVSS 6.1) affecting autobahn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Autobahn|Python before 20.12.3 allows redirect header injection.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-601
Published	2020-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: crossbar

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

Am I affected?

Timeline

2020-12-27 00:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

crossbar autobahn UPGRADE

Affected: < 20.12.3

Fixed in: 20.12.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 20.12.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade autobahn

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-2020-35678?

autobahn: upgrade to 20.12.3. Exact commands for each OS are on this page.

Is CVE-2020-35678 being exploited?

CVE-2020-35678 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-2020-35678 affect?

CVE-2020-35678 affects autobahn. Severity is medium (CVSS 6.1). Autobahn|Python before 20.12.3 allows redirect header injection.

How urgent is CVE-2020-35678?

Priority 40/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

References

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