CVE-2022-45059: An issue was discovered in Varnish Cache 7.x before 7.1.2 and 7.2.x before 7.2.1

This month

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2022-45059 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.

An issue was discovered in Varnish Cache 7.x before 7.1.2 and 7.2.x before 7.2.1. A request smuggling attack can be performed on Varnish Cache servers by requesting that certain headers are made hop-by-hop, preventing the Varnish Cache servers from forwarding critical headers to the backend.

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	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-444
Published	2022-11-09
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

2022-11-09 06:15 UTCPublished CVE record published
2026-06-17 05:09 UTCUpdated Record last modified

varnish cache project varnish cache UPGRADE

Affected: >= 7.0.0 and < 7.1.2 · 7.2.0

Fixed in: 7.1.2

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. UPGRADE to 7.1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade varnish-cache

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade varnish-cache

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 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

3. If no update is available yet, 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 · 37

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-2022-45059?

varnish cache: upgrade to 7.1.2; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-45059 being exploited?

CVE-2022-45059 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-2022-45059 affect?

CVE-2022-45059 affects varnish cache, fedora. Severity is high (CVSS 7.5). An issue was discovered in Varnish Cache 7.x before 7.1.2 and 7.2.x before 7.2.1. A request smuggling attack can be performed on Varnish Cache servers by requesting that certain headers are made hop-by-hop, preventing the Varnish Cache serv

How urgent is CVE-2022-45059?

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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