CVE-2021-32769 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in micronaut-core
Attackers can read arbitrary files from the server filesystem via path traversal in Micronaut Core, requiring an upgrade to secure the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32769?
CVE-2021-32769 is a high-severity path traversal vulnerability in micronaut-projects micronaut-core, published on 16 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using "/../../" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.
Weakness: CWE-22
Which versions are affected by CVE-2021-32769?
2 open source packages ship an affected version, including io.micronaut:micronaut-http-server-netty. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.micronaut:micronaut-http-server-netty Maven | All versions | 2.5.9 |
io.micronaut:micronaut-http-server-netty Maven | All versions | 2.5.9 |
Products include Objectcomputing Micronaut.
How do I fix CVE-2021-32769?
Upgrade io.micronaut:micronaut-http-server-netty to 2.5.9 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-32769 being exploited?
There is no known exploitation of CVE-2021-32769 in the wild and no public exploit code.
Other vulnerabilities in micronaut-projects micronaut-core
- CVE-2020-7611 Micronaut's HTTP client is vulnerable to HTTP Request Header Injection
- CVE-2026-33013 Micronaut vulnerable to DoS via crafted form-urlencoded body binding with descending array indices
- CVE-2026-33012 Micronaut Framework vulnerable to a Denial of Service in HTML error response caching
- CVE-2022-21700 Memory leak in micronaut-core
- CVE-2024-23639 micronaut-core management endpoints vulnerable to drive-by localhost attack
Sources
Also known as GHSA-cjx7-399x-p2rj.