High severity · published Feb 17, 2023
CVE-2021-33926
An issue in Plone CMS v
8.8
CVSS
1%
EPSS
No
On KEV
Description
An issue in Plone CMS v. 5.2.4, 5.2.3, 5.2.2, 5.2.1, 5.2.0, 5.1rc2, 5.1rc1, 5.1b4, 5.1b3, 5.1b2, 5.1a2, 5.1a1, 5.1.7, 5.1.6, 5.1.5, 5.1.4, 5.1.2, 5.1.1 5.1, 5.0rc3, 5.0rc2, 5.0rc1, 5.0.9, 5.0.8, 5.0.7, 5.0.6, 5.0.5, 5.0.4, 5.0.3, 5.0.2, 5.0.10, 5.0.1, 5.0, 4.3.9, 4.3.8, 4.3.7, 4.3.6, 4.3.5, 4.3.4, 4.3.3, 4.3.20, 4 allows attacker to access sensitive information via the RSS feed protlet.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PL
Plone · Plone
4.3; 4.3.1; 4.3.2; 4.3.3; 4.3.4; 4.3.5; +34 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33926
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33926
Exploit
https://github.com/s-kustm/Subodh/blob/master/Plone%205.2.4%20Vulnerable%20to%20bilend%20SSRF.pdf
Release Notes
https://plone.org/security/hotfix/20210518
Vendor Advisory
https://plone.org/security/hotfix/20210518/blind-ssrf-via-feedparser-accessing-an-internal-url
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