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CVE-2021-28834

CRITICALCVSS 9.8/10EPSS 2.82%

Last modified

CVE-2021-28834 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.. EPSS estimates a 2.82% chance of exploitation in the next 30 days.

Description

Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
2.82%

84.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
Kramdown ProjectKramdown< 2.3.1
FedoraprojectFedora32
FedoraprojectFedora33
FedoraprojectFedora34
DebianDebian Linux10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-28834?
Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.
How severe is CVE-2021-28834?
CVE-2021-28834 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.82% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28834?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28834?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST