CVE•Published 2021-04-13•Modified 2026-10-07•1 article on news•5 live references•NVD data

CVE-2021-29425Apache · Commons_io

Vulnerability data via NVD (ingested)

CVSS v3.1

4.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS percentile

Exploit Prediction Scoring System · top 5% of all CVEs

Weaknesses (CWE)

CWE-20Improper Input Validation CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Description

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.

Timeline

Published 2021-04-13

Modified 2026-10-07

External references

NVD MITRE GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag5 hosts

vuln:CVE-2021-29425

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product + version

product:"Apache Commons Io" version:"2.2"

Version-pinned fingerprint from NVD's first vulnerable CPE.

Shodan · banner/body mention

http.html:"Commons Io"

HTTP body or banner mentions "Commons Io" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-29425