CVE-2019-12499
CVE-2019-12499 is a high-severity vulnerability in Firejail Project Firejail with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v2: 9.3
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Firejail Project Firejail
- Published:
- Last modified:
Description
Firejail before 0.9.60 allows truncation (resizing to length 0) of the firejail binary on the host by running exploit code inside a firejail sandbox and having the sandbox terminated. To succeed, certain conditions need to be fulfilled: The jail (with the exploit code inside) needs to be started as root, and it also needs to be terminated as root from the host (either by stopping it ungracefully (e.g., SIGKILL), or by using the --shutdown control command). This is similar to CVE-2019-5736.
Frequently asked questions
- What is CVE-2019-12499?
- Firejail before 0.9.60 allows truncation (resizing to length 0) of the firejail binary on the host by running exploit code inside a firejail sandbox and having the sandbox terminated. To succeed, certain conditions need to be fulfilled: The jail (with the exploit code inside) needs to be started as root, and it also needs to be terminated as root from the host (either by stopping it ungracefully (e.g., SIGKILL), or by using the --shutdown control command). This is similar to CVE-2019-5736.
- How severe is CVE-2019-12499?
- CVE-2019-12499 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-12499 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-12499?
- CVE-2019-12499 affects Firejail Project Firejail. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-12499?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2019-12499 published?
- CVE-2019-12499 was published on 2019-05-31 and last updated on 2026-06-17.
References
- https://github.com/netblue30/firejail/issues/2401
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CDY7B73YDRBURA25APSHD5PFEO4TNSFW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGVULJ6IKVDO6UAVIQRHQVSKOUD6QDWM/
Affected products (1)
- cpe:2.3:a:firejail_project:firejail:*:*:*:*:-:*:*:*
More vulnerabilities in Firejail Project Firejail
- CVE-2020-17368 — Critical (CVSS 9.8): Firejail through 0.9.62 mishandles shell metacharacters during use of the --output or --output-stderr option, which may…
- CVE-2017-5206 — Critical (CVSS 9.0): Firejail before 0.9.44.4, when running on a Linux kernel before 4.8, allows context-dependent attackers to bypass a…
- CVE-2019-12589 — High (CVSS 8.8): In Firejail before 0.9.60, seccomp filters are writable inside the jail, leading to a lack of intended seccomp…
- CVE-2017-5940 — High (CVSS 8.8): Firejail before 0.9.44.6 and 0.9.38.x LTS before 0.9.38.10 LTS does not comprehensively address dotfile cases during…
- CVE-2017-5180 — High (CVSS 8.8): Firejail before 0.9.44.4 and 0.9.38.x LTS before 0.9.38.8 LTS does not consider the .Xauthority case during its attempt…
- CVE-2016-9016 — High (CVSS 8.8): Firejail 0.9.38.4 allows local users to execute arbitrary commands outside of the sandbox via a crafted TIOCSTI ioctl…