HOMEVULNERABILITIESCVE-2021-32633
HIGH

CVE-2021-32633

CWE-22Published: May 21, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-32633 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

plone1 product(s)
plone
zope1 product(s)
zope
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91
PATCHhttps://github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/05/21/1
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/05/22/1
ADVISORYhttps://cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/
ADVISORYhttps://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/05/21/1
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/05/22/1
ADVISORYhttps://cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/
ADVISORYhttps://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36

All References (10)

→
http://www.openwall.com/lists/oss-security/2021/05/21/1Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/05/22/1Mailing List · Third Party Advisory
→
https://cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/Exploit · Third Party Advisory
→
https://github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91Patch · Third Party Advisory
→
https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/05/21/1Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/05/22/1Mailing List · Third Party Advisory
→
https://cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/Exploit · Third Party Advisory
→
https://github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91Patch · Third Party Advisory
→
https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36Third Party Advisory

Quick Facts

CVE IDCVE-2021-32633
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
Affected2 vendor(s)
PublishedMay 21, 2021

Related CVEs (CWE-22)

CVE-2008-4489
10.0
CVE-2009-0841
10.0
CVE-2008-2241
10.0
CVE-2007-5005
10.0
CVE-2008-2403
10.0
CVE-2009-1161
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-32633 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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