CVE-2017-5206 — Firejail before 0

Firejail before 0.9.44.4, when running on a Linux kernel before 4.8, allows context-dependent attackers to bypass a seccomp-based sandbox protection mechanism via the --allow-debuggers argument.

01What is this vulnerability?

Firejail before 0.9.44.4, when running on a Linux kernel before 4.8, allows context-dependent attackers to bypass a seccomp-based sandbox protection mechanism via the --allow-debuggers argument.

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: 2017-03-23T16:59:00.417
• Last modified: 2026-05-13T00:24:29.033

09References

• www.openwall.com — http://www.openwall.com/lists/oss-security/2017/01/07/5
• www.securityfocus.com — http://www.securityfocus.com/bid/97120
• blog.lizzie.io — https://blog.lizzie.io/linux-containers-in-500-loc.html#fn.51
• firejail.wordpress.com — https://firejail.wordpress.com/download-2/release-notes/
• github.com — https://github.com/netblue30/firejail/commit/6b8dba29d73257311564ee7f27b9b14758c…
• security.gentoo.org — https://security.gentoo.org/glsa/201701-62
• www.openwall.com — http://www.openwall.com/lists/oss-security/2017/01/07/5
• www.securityfocus.com — http://www.securityfocus.com/bid/97120
• blog.lizzie.io — https://blog.lizzie.io/linux-containers-in-500-loc.html#fn.51
• firejail.wordpress.com — https://firejail.wordpress.com/download-2/release-notes/