What is CVE-2019-11839?

CVE-2019-11839 is a critical-severity vulnerability in F5 Njs, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-05-09.

How severe is CVE-2019-11839?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in F5 Njs

CVE-2019-11839

njs through 0.3.1, used in NGINX, has a heap-based buffer overflow in Array.prototype.push after a resize, related to njs_array_prototype_push in njs/njs_array.c, because of njs_array_expand size mishandling.

Vulnerability class: Buffer Overflow

EPSS: 0.016 (73.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

F5 Njs
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2019-11839?: CVE-2019-11839 is a critical-severity vulnerability in F5 Njs, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-05-09.
How severe is CVE-2019-11839?: Critical severity. CVSS v3 base score is 9.8 out of 10.