How severe is CVE-2021-23342?

CVE-2021-23342 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2021-23342 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23342?

CVE-2021-23342 affects Docsifyjs Docsify. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23342?

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-2021-23342 published?

CVE-2021-23342 was published on 2021-02-19 and last updated on 2026-06-17.

CVE-2021-23342

CVE-2021-23342 is a high-severity vulnerability in Docsifyjs Docsify with a CVSS 3.x base score of 8.6. 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-79.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 4.3
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Docsifyjs Docsify
Published: 2021-02-19
Last modified: 2026-06-17

Description

This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters

Frequently asked questions

What is CVE-2021-23342?: This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters
How severe is CVE-2021-23342?: CVE-2021-23342 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2021-23342 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23342?: CVE-2021-23342 affects Docsifyjs Docsify. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23342?: 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-2021-23342 published?: CVE-2021-23342 was published on 2021-02-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:docsifyjs:docsify:*:*:*:*:*:*:*:*

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