CVE-2023-39810 — An issue in the CPIO command of Busybox v1

An issue in the CPIO command of Busybox v1.33.2 allows attackers to execute a directory traversal.

01What is this vulnerability?

An issue in the CPIO command of Busybox v1.33.2 allows attackers to execute a directory traversal.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-08-28T19:15:07.893
• Last modified: 2026-07-09T01:18:36.670

09References

• www.pentagrid.ch — https://www.pentagrid.ch/en/blog/busybox-cpio-directory-traversal-vulnerability/
• www.openwall.com — http://www.openwall.com/lists/oss-security/2025/04/23/1
• www.openwall.com — http://www.openwall.com/lists/oss-security/2025/04/23/2
• www.openwall.com — http://www.openwall.com/lists/oss-security/2025/04/23/3
• www.openwall.com — http://www.openwall.com/lists/oss-security/2025/04/24/2
• www.pentagrid.ch — https://www.pentagrid.ch/en/blog/busybox-cpio-directory-traversal-vulnerability/