CVE-2021-38221: bbs-go <= 3.3.0 including Custom Edition is vulnerable to stored XSS.

Q: How do I fix CVE-2021-38221?

bbs-go: upgrade to newer than 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-38221 being exploited?

CVE-2021-38221 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-2021-38221 affect?

CVE-2021-38221 affects bbs-go. Severity is medium (CVSS 5.4). bbs-go <= 3.3.0 including Custom Edition is vulnerable to stored XSS.

Q: How urgent is CVE-2021-38221?

Priority 35/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-38221 is a medium-severity flaw (CVSS 5.4) affecting bbs-go. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

bbs-go <= 3.3.0 including Custom Edition is vulnerable to stored XSS.

Why this priority

Public exploit reference

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	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-06-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bbs-go project

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

Am I affected?

Timeline

2022-06-02 18:15 UTCPublished CVE record published
2026-06-17 04:01 UTCUpdated Record last modified

bbs-go project bbs-go UPGRADE

Affected: <= 3.3.0

Fixed in: newer than 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bbs-go || rpm -q bbs-go || bbs-go --version

2. UPGRADE to newer than 3.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bbs-go

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bbs-go

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-2021-38221?

bbs-go: upgrade to newer than 3.3.0. Exact commands for each OS are on this page.

Is CVE-2021-38221 being exploited?

CVE-2021-38221 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-2021-38221 affect?

CVE-2021-38221 affects bbs-go. Severity is medium (CVSS 5.4). bbs-go <= 3.3.0 including Custom Edition is vulnerable to stored XSS.

How urgent is CVE-2021-38221?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2023-36223 MEDIUM 5.4 UPGRADE Cross Site Scripting vulnerability in mlogclub bbs-go v
CVE-2023-36222 MEDIUM 5.4 UPGRADE Cross Site Scripting vulnerability in mlogclub bbs-go v

References

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