How severe is CVE-2021-23422?

CVE-2021-23422 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-23422 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23422?

CVE-2021-23422 affects Bikeshed Project Bikeshed. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23422?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-23422 published?

CVE-2021-23422 was published on 2021-08-16 and last updated on 2026-06-17.

CVE-2021-23422

CVE-2021-23422 is a high-severity vulnerability in Bikeshed Project Bikeshed with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Bikeshed Project Bikeshed
Published: 2021-08-16
Last modified: 2026-06-17

Description

This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing Inline Tag Command metadata is processed. When an arbitrary OS command is executed, the command output would be included in the HTML output.

Frequently asked questions

What is CVE-2021-23422?: This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing Inline Tag Command metadata is processed. When an arbitrary OS command is executed, the command output would be included in the HTML output.
How severe is CVE-2021-23422?: CVE-2021-23422 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-23422 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23422?: CVE-2021-23422 affects Bikeshed Project Bikeshed. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23422?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-23422 published?: CVE-2021-23422 was published on 2021-08-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bikeshed_project:bikeshed:*:*:*:*:*:*:*:*

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