CVE-2021-29425
Possible limited path traversal vulnerabily in Apache Commons IO
- Published
- Apr 13, 2021
- Updated
- Aug 3, 2024
- Assigning CNA
- apache
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NModerate · next 30 days
- Percentile
- 95.5%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
In Apache Commons IO before 2.7, When invoking the method FileNameUtils.normalize with an improper input string, like "//../foo", or "\\..\foo", the result would be the same value, thus possibly providing access to files in the parent directory, but not further above (thus "limited" path traversal), if the calling code would use the result to construct a path value.
Sources
1Proof-of-concept exploit for CVE-2021-29425, an XML External Entity (XXE) vulnerability in Apache Tika, demonstrating file disclosure and SSRF via crafted files.
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