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CVE-2021-32633

Remote Code Execution via traversal in TAL expressions

HIGH
8.8
CVSS Score
Published: May 21, 2021 at 01:55 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
3 products affected across 3 vendorsPloneZopeZope

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Severity
HIGH8.8
Exploit prediction
EPSS 2%

Description

Zope is an open-source web application server. In Zope versions prior to 4.6 and 5.2, users can access untrusted modules indirectly through Python modules that are available for direct use. By default, only users with the Manager role can add or edit Zope Page Templates through the web, but sites that allow untrusted users to add/edit Zope Page Templates through the web are at risk from this vulnerability. The problem has been fixed in Zope 5.2 and 4.6. As a workaround, a site administrator can restrict adding/editing Zope Page Templates through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing Zope Page Templates through the web should be restricted to trusted users only.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Plone· Plone
95%
v ≤ 4.3.205.0 ≤ v ≤ 5.2.4
Zope· Zope
95%
v < 4.65.0 ≤ v < 5.2
Affected range stops below 4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2, so it looks safe — our inference, not a vendor statement
Zope· Zopefoundationpypi
60%
v < 4.6v < 5.2
Affected range stops below 4.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/05/21/1
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2021/05/22/1
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91
x_refsource_CONFIRMx_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-22

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