How severe is CVE-2021-4017?

CVE-2021-4017 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-4017 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4017?

CVE-2021-4017 affects Showdoc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4017?

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-2021-4017 published?

CVE-2021-4017 was published on 2021-12-01 and last updated on 2026-06-17.

CVE-2021-4017

CVE-2021-4017 is a high-severity vulnerability in Showdoc with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Showdoc
Published: 2021-12-01
Last modified: 2026-06-17

Description

showdoc is vulnerable to Cross-Site Request Forgery (CSRF)

Frequently asked questions

What is CVE-2021-4017?: showdoc is vulnerable to Cross-Site Request Forgery (CSRF)
How severe is CVE-2021-4017?: CVE-2021-4017 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-4017 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4017?: CVE-2021-4017 affects Showdoc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4017?: 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-2021-4017 published?: CVE-2021-4017 was published on 2021-12-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:showdoc:showdoc:*:*:*:*:*:*:*:*

More vulnerabilities in Showdoc

CVE-2022-0362 — Critical (CVSS 9.8): SQL Injection in Packagist showdoc/showdoc prior to 2.10.3.
CVE-2021-41745 — Critical (CVSS 9.8): ShowDoc 2.8.3 ihas a file upload vulnerability, where attackers can use the vulnerability to obtain server permissions.
CVE-2021-36440 — Critical (CVSS 9.8): Unrestricted File Upload in ShowDoc v2.9.5 allows remote attackers to execute arbitrary code via the 'file_url'…
CVE-2021-4168 — High (CVSS 8.8): showdoc is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2022-0409 — High (CVSS 7.8): Unrestricted Upload of File with Dangerous Type in Packagist showdoc/showdoc prior to 2.10.2.
CVE-2022-1034 — High (CVSS 7.2): There is a Unrestricted Upload of File vulnerability in ShowDoc v2.10.3 in GitHub repository star7th/showdoc prior to…

All CVEs affecting Showdoc →

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