CVE-2021-33510 Server-Side Request Forgery in Plone
Remote authenticated managers can perform Server-Side Request Forgery to read file contents via event ical URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-33510?
CVE-2021-33510 is a medium-severity server-side request forgery vulnerability in Plone Plone, published on 21 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2021-33510?
3 open source packages ship an affected version, including plone and Plone. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
plone PyPI | All versions to 5.2.4 | None |
plone PyPI | All versions | 5.2.5 |
Plone PyPI | All versions to 5.2.4 | None |
Products include Plone Plone.
How do I fix CVE-2021-33510?
Upgrade plone to 5.2.5 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-33510 being exploited?
There is no known exploitation of CVE-2021-33510 in the wild and no public exploit code.
Other vulnerabilities in Plone Plone
Sources
Also known as GHSA-4mg4-wvmx-5332, PYSEC-2021-82.