CVE-2022-38150: In Varnish Cache 7.0.0, 7.0.1, 7.0.2, and 7.1.0, it is possible to cause the Varnish Server to assert and auto

This month

HIGH 7.5REMOTEDOWNGRADEMITIGATE

CVE-2022-38150 is a high-severity flaw (CVSS 7.5) affecting varnish cache, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Varnish Cache 7.0.0, 7.0.1, 7.0.2, and 7.1.0, it is possible to cause the Varnish Server to assert and automatically restart through forged HTTP/1 backend responses. An attack uses a crafted reason phrase of the backend response status line. This is fixed in 7.0.3 and 7.1.1.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-400
Published	2022-08-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · varnish cache project

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

Am I affected?

Timeline

2022-08-11 01:15 UTCPublished CVE record published
2026-06-17 04:56 UTCUpdated Record last modified

varnish cache project varnish cache DOWNGRADE

Affected: 7.0.0 · 7.0.1 · 7.0.2 · 7.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison varnish-cache sudo apt install varnish-cache=<VERSION_BEFORE_7.0.0> sudo apt-mark hold varnish-cache

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list varnish-cache sudo dnf downgrade varnish-cache-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add varnish-cache

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.

fedoraproject fedora MITIGATE

Affected: 35 · 36

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

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-2022-38150?

varnish cache: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-38150 being exploited?

CVE-2022-38150 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-2022-38150 affect?

CVE-2022-38150 affects varnish cache, fedora. Severity is high (CVSS 7.5). In Varnish Cache 7.0.0, 7.0.1, 7.0.2, and 7.1.0, it is possible to cause the Varnish Server to assert and automatically restart through forged HTTP/1 backend responses. An attack uses a crafted reason phrase of the backend response status l

How urgent is CVE-2022-38150?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Software pages

Varnish vulnerabilities

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References

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