What’s Vulnerable › Vulnerabilities

CVE-2021-33510

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-918

Description

Plone through 5.2.4 allows remote authenticated managers to conduct SSRF attacks via an event ical URL, to read one line of a file.

Affected products

• Plone CMS: through 5.2.4

References

• http://www.openwall.com/lists/oss-security/2021/05/22/1
• https://plone.org/security/hotfix/20210518/server-side-request-forgery-via-event-ical-url
• http://www.openwall.com/lists/oss-security/2021/05/22/1
• https://plone.org/security/hotfix/20210518/server-side-request-forgery-via-event-ical-url

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