CVE-2020-9491 json
Inadequate Encryption Strength in Apache NiFi
published 2020-10-01 6 y ago modified 2026-09-08 2 mo ago also BIT-nifi-2020-9491 , EUVD-2022-0688 , GHSA-rfmp-jvr7-hx78
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.9%
- EPSS 2.9% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
In Apache NiFi 1.2.0 to 1.11.4, the NiFi UI and API were protected by mandating TLS v1.2, as well as listening connections established by processors like ListenHTTP, HandleHttpRequest, etc. However intracluster communication such as cluster request replication, Site-to-Site, and load balanced queues continued to support TLS v1.0 or v1.1.
Patch / fix
Exploit prediction
2.87% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| 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 |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.apache.nifi:nifi | >=1.2.0, <1.12.0-RC1 |
1.12.0-RC1 |
| bitnami | nifi | >=1.0.0, <=1.11.4 |
no fix listed |
Affected products
- n/a Apache NiFi
Classification
- Weakness
-
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm
References
-
github.com
/apache/nifi/commit/441781cec50f77d9f1e65093f55bbd614b8c5ec6
web
-
nifi.apache.org
/security#CVE-2020-9491
web, vendor-advisory, advisory
-
lists.apache.org
/thread.html/re48582efe2ac973f8cff55c8b346825cb491c71935e15ab2d61ef3bf%40%3Ccommits.nifi.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r2d9c21f9ec35d66f2bb42f8abe876dabd786166b6284e9a33582c718%40%3Ccommits.nifi.apache.org%3E
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2020-9491
advisory, web
-
github.com
/apache/nifi
package
-
lists.apache.org
/thread.html/r2d9c21f9ec35d66f2bb42f8abe876dabd786166b6284e9a33582c718@%3Ccommits.nifi.apache.org%3E
web
-
lists.apache.org
/thread.html/re48582efe2ac973f8cff55c8b346825cb491c71935e15ab2d61ef3bf@%3Ccommits.nifi.apache.org%3E
web
Sources
- CVE List CVE-2020-9491
- GitHub Advisory GHSA-rfmp-jvr7-hx78
- NVD CVE-2020-9491
- OSV BIT-nifi-2020-9491
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.