CVE-2022-39348: Twisted is an event-based framework for internet applications

This month

MEDIUM 5.4WATCHLISTUPGRADEMITIGATE

CVE-2022-39348 is a medium-severity flaw (CVSS 5.4) affecting twisted, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Twisted is an event-based framework for internet applications. Started with version 0.9.4, when the host header does not match a configured host `twisted.web.vhost.NameVirtualHost` will return a `NoResource` resource which renders the Host header unescaped into the 404 response allowing HTML and script injection. In practice this should be very difficult to exploit as being able to modify the Host header of a normal HTTP request implies that one

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-79, CWE-80
Published	2022-10-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: debian · twisted

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

Am I affected?

Timeline

2022-10-26 20:15 UTCPublished CVE record published
2026-06-17 04:58 UTCUpdated Record last modified

twisted twisted UPGRADE

Affected: >= 0.9.4 and < 22.10.0

Fixed in: 22.10.0

Safe to downgrade to: a release before 0.9.4

1. Check installed version

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

2. UPGRADE to 22.10.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade twisted

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.9.4 (Debian / Ubuntu)

apt-cache madison twisted sudo apt install twisted=<VERSION_BEFORE_0.9.4> sudo apt-mark hold twisted

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list twisted sudo dnf downgrade twisted-<VERSION_BEFORE_0.9.4> sudo dnf versionlock add twisted

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

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-2022-39348?

twisted: upgrade to 22.10.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-39348 being exploited?

CVE-2022-39348 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-2022-39348 affect?

CVE-2022-39348 affects twisted, debian linux. Severity is medium (CVSS 5.4). Twisted is an event-based framework for internet applications. Started with version 0.9.4, when the host header does not match a configured host `twisted.web.vhost.NameVirtualHost` will return a `NoResource` resource which renders the Host

How urgent is CVE-2022-39348?

Priority 48/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-42304 HIGH 7.5 UPGRADE Twisted is an event-based framework for internet applications, supporting Python 3.6+
CVE-2024-41810 MEDIUM 6.1 UPGRADE Twisted is an event-based framework for internet applications, supporting Python 3.6+
CVE-2023-46137 MEDIUM 5.3 UPGRADE Twisted is an event-based framework for internet applications
CVE-2022-24801 HIGH 8.1 UPGRADE MITIGATE Twisted is an event-based framework for internet applications, supporting Python 3.6+
CVE-2022-21716 HIGH 7.5 UPGRADE MITIGATE Twisted is an event-based framework for internet applications, supporting Python 3.6+

References

← Back to latest CVEs