How severe is CVE-2021-20737?

CVE-2021-20737 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-20737 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20737?

CVE-2021-20737 affects Weseek Growi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20737?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20737 published?

CVE-2021-20737 was published on 2021-06-22 and last updated on 2026-06-17.

CVE-2021-20737

CVE-2021-20737 is a medium-severity vulnerability in Weseek Growi with a CVSS 3.x base score of 6.5. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Weseek Growi
Published: 2021-06-22
Last modified: 2026-06-17

Description

Improper authentication vulnerability in GROWI versions prior to v4.2.20 allows a remote attacker to view the unauthorized pages without access privileges via unspecified vectors.

Frequently asked questions

What is CVE-2021-20737?: Improper authentication vulnerability in GROWI versions prior to v4.2.20 allows a remote attacker to view the unauthorized pages without access privileges via unspecified vectors.
How severe is CVE-2021-20737?: CVE-2021-20737 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-20737 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20737?: CVE-2021-20737 affects Weseek Growi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20737?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20737 published?: CVE-2021-20737 was published on 2021-06-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:weseek:growi:*:*:*:*:*:*:*:*

More vulnerabilities in Weseek Growi

CVE-2021-20736 — Critical (CVSS 9.1): NoSQL injection vulnerability in GROWI versions prior to v4.2.20 allows a remote attacker to obtain and/or alter the…
CVE-2019-5968 — High (CVSS 8.8): Cross-site request forgery (CSRF) vulnerability in GROWI v3.4.6 and earlier allows remote attackers to hijack the…
CVE-2021-3852 — High (CVSS 7.5): growi is vulnerable to Authorization Bypass Through User-Controlled Key
CVE-2021-20670 — High (CVSS 7.5): Improper access control vulnerability in GROWI versions v4.2.2 and earlier allows a remote unauthenticated attacker to…
CVE-2020-5683 — High (CVSS 7.5): Directory traversal vulnerability in GROWI versions prior to v4.2.3 (v4.2 Series), GROWI versions prior to v4.1.12…
CVE-2020-5682 — High (CVSS 7.5): Improper input validation in GROWI versions prior to v4.2.3 (v4.2 Series), GROWI versions prior to v4.1.12 (v4.1…

All CVEs affecting Weseek Growi →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →