CVE-2021-33510 json
Server-Side Request Forgery in Plone
published 2021-05-21 5 y ago modified 2026-06-17 4 mo ago also GHSA-4mg4-wvmx-5332 , PYSEC-2021-82 , EUVD-2021-0192
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi plone 5.2.5
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | plone | <=5.2.4 <5.2.5 |
5.2.5 |
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
plone.org
/security/hotfix/20210518/server-side-request-forgery-via-event-ical-url
web, vendor-advisory
-
openwall.com
/lists/oss-security/2021/05/22/1
mailing-list, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-33510
advisory
-
github.com
/advisories/GHSA-4mg4-wvmx-5332
advisory
-
github.com
/plone/Plone
package
-
github.com
/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2021-82.yaml
web
Sources
- CVE List CVE-2021-33510
- GitHub Advisory GHSA-4mg4-wvmx-5332
- NVD CVE-2021-33510
- OSV PYSEC-2021-82
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.