CVE-2020-9491 Inadequate Encryption Strength in Apache NiFi
Apache NiFi allows weak TLS versions for internal cluster communications, potentially enabling man-in-the-middle attacks against replicated data and queues.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-9491?
CVE-2020-9491 is a high-severity vulnerability in Apache Nifi, published on 1 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-327
Which versions are affected by CVE-2020-9491?
3 open source packages ship an affected version, including org.apache.nifi:nifi and nifi. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.nifi:nifi Maven | From 1.2.0 | 1.12.0-RC1 |
org.apache.nifi:nifi Maven | From 1.2.0 | 1.12.0-RC1 |
nifi Bitnami | From 1.0.0 to 1.11.4 | None |
Products include Apache Nifi.
How do I fix CVE-2020-9491?
Upgrade org.apache.nifi:nifi to 1.12.0-RC1 or later.
Is CVE-2020-9491 being exploited?
There is no known exploitation of CVE-2020-9491 in the wild and no public exploit code.
Other vulnerabilities in Apache Nifi
- CVE-2018-1309 Improper Restriction of XML External Entity Reference in Apache NiFi
- CVE-2017-15697 Apache NiFi XSS issue in context path handling
- CVE-2017-5636 Injection in Apache NiFi
- CVE-2026-68981 Apache NiFi: Uncontrolled Resource Consumption through Decompression of HTTP Requests
- CVE-2023-36542 Apache NiFi: Potential Code Injection with Properties Referencing Remote Resources
Sources
Also known as BIT-nifi-2020-9491, GHSA-rfmp-jvr7-hx78.