CVE-2021-21337

Products.Pluggableauthservice vulnerability

CVSS

5.7

EPSS

8.4%

EPSS pct

94th

Exploited

No known

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".

Affected vendor

Zope

Affected product

Products.Pluggableauthservice

CVSS vector

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

Weakness type (CWE)

CWE-601 — Open Redirect

Published

2021-03-08

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 8.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2021-21337

Confirm whether Zope Products.Pluggableauthservice is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-21337.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-21337

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-21337 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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