CVE-2021-47208: The Mojolicious module before 9.11 for Perl has a bug in format detection that can potentially be exploited fo

Q: How do I fix CVE-2021-47208?

mojolicious: upgrade to 9.11. Exact commands for each OS are on this page.

Q: Is CVE-2021-47208 being exploited?

CVE-2021-47208 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-2021-47208 affect?

CVE-2021-47208 affects mojolicious. Severity is medium (CVSS 4.3). The Mojolicious module before 9.11 for Perl has a bug in format detection that can potentially be exploited for denial of service.

Q: How urgent is CVE-2021-47208?

Priority 32/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-47208 is a medium-severity flaw (CVSS 4.3) affecting mojolicious. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Mojolicious module before 9.11 for Perl has a bug in format detection that can potentially be exploited for denial of service.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-400
Published	2024-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mojolicious

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

Am I affected?

Timeline

2024-04-08 00:15 UTCPublished CVE record published
2026-06-17 04:16 UTCUpdated Record last modified

mojolicious mojolicious UPGRADE

Affected: < 9.11

Fixed in: 9.11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.11 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mojolicious

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-2021-47208?

mojolicious: upgrade to 9.11. Exact commands for each OS are on this page.

Is CVE-2021-47208 being exploited?

CVE-2021-47208 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-2021-47208 affect?

CVE-2021-47208 affects mojolicious. Severity is medium (CVSS 4.3). The Mojolicious module before 9.11 for Perl has a bug in format detection that can potentially be exploited for denial of service.

How urgent is CVE-2021-47208?

Priority 32/100. Public exploit reference

Software pages

Perl vulnerabilities

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References

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