CVE-2020-11991 in the critical feed json
When using the StreamGenerator, the code parse a user-provided XML.
published 2020-09-11 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4311
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 72.5%
- EPSS 72.5% chance of exploitation in 30 days, percentile 99.4%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
When using the StreamGenerator, the code parse a user-provided XML. A specially crafted XML, including external system entities, could be used to access any file on the server system.
Exploit prediction
72.46% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Apache Cocoon 2.1.12 - XML Injection nuclei detection template
- lists.apache.org https://lists.apache.org/thread.html/r77add973ea521185e1a90aca00ba9dae7caa8d8b944d92421702bb54%40%3Cusers.cocoon.apache.org%3E referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- n/a Apache Cocoon
Classification
- Weakness
-
- CWE-611 Improper Restriction of XML External Entity Reference
References
-
lists.apache.org
/thread.html/r77add973ea521185e1a90aca00ba9dae7caa8d8b944d92421702bb54%40%3Cusers.cocoon.apache.org%3E
exploit, mailing-list, vendor-advisory
Sources
- CVE List CVE-2020-11991
- NVD CVE-2020-11991
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.