Is CVE-2021-21337 in the CISA KEV catalog?

No. CVE-2021-21337 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21337?

CVE-2021-21337 has a CVSS v3 base score of 5.7 (MEDIUM).

What is the EPSS score for CVE-2021-21337?

CVE-2021-21337 has an EPSS score of 8.44% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21337?

Upgrade products.pluggableauthservice to 2.6.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-21337

MEDIUMEPSS 94th pctl

5.7

CVSS v3

NVD

Description

Products.PluggableAuthService is a pluggable Zope authentication and authorization framework. In Products.PluggableAuthService before version 2.6.0 there is an open redirect vulnerability. A maliciously crafted link to the login form and login functionality could redirect the browser to a different website. The problem has been fixed in version 2.6.1. Depending on how you have installed Products.PluggableAuthService, you should change the buildout version pin to `2.6.1` and re-run the buildout, or if you used `pip` simply do `pip install "Products.PluggableAuthService>=2.6.1".

CWE-601Open Redirect

How to fix

Remediation Available

products.pluggableauthserviceNVD

Affected:< 2.6.1Fixed in:2.6.1CVE-2021-21337derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

8.44%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch1

github.com

Exploit1

packetstormsecurity.com

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.