CVE-2022-45956: Boa Web Server versions 0.94.13 through 0.94.14 fail to validate the correct security constraint on the HEAD H

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2022-45956 is a medium-severity flaw (CVSS 5.3) affecting boa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Boa Web Server versions 0.94.13 through 0.94.14 fail to validate the correct security constraint on the HEAD HTTP method allowing everyone to bypass the Basic Authorization mechanism.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-863
Published	2022-12-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: boa

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

Am I affected?

Timeline

2022-12-12 15:15 UTCPublished CVE record published
2026-06-17 05:11 UTCUpdated Record last modified

boa boa DOWNGRADE

Affected: 0.94.13 · 0.94.14

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.94.13

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.94.13 (Debian / Ubuntu)

apt-cache madison boa sudo apt install boa=<VERSION_BEFORE_0.94.13> sudo apt-mark hold boa

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

dnf --showduplicates list boa sudo dnf downgrade boa-<VERSION_BEFORE_0.94.13> sudo dnf versionlock add boa

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.

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-2022-45956?

boa: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-45956 being exploited?

CVE-2022-45956 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-2022-45956 affect?

CVE-2022-45956 affects boa. Severity is medium (CVSS 5.3). Boa Web Server versions 0.94.13 through 0.94.14 fail to validate the correct security constraint on the HEAD HTTP method allowing everyone to bypass the Basic Authorization mechanism.

How urgent is CVE-2022-45956?

Priority 43/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-44117 CRITICAL 9.8 DOWNGRADE Boa 0.94.14rc21 is vulnerable to SQL Injection via username
CVE-2021-33558 HIGH 7.5 DOWNGRADE Boa 0.94.13 allows remote attackers to obtain sensitive information via a misconfiguration involving backup.ht

References

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