What is CVE-2020-24346?

CVE-2020-24346 is a high-severity vulnerability in F5 Njs, classified under Use After Free. CVSS score: 7.8/10. Published 2020-08-13.

How severe is CVE-2020-24346?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in F5 Njs

CVE-2020-24346

njs through 0.4.3, used in NGINX, has a use-after-free in njs_json_parse_iterator_call in njs_json.c.

Vulnerability class: Use-After-Free

Published 2020-08-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

F5 Njs

Weakness classification (CWE)

CWE-416 — Use After Free

References

github.com/nginx/njs/issues/325 (Exploit, Patch, Third Party Advisory, Issue Tracking)
security.netapp.com/advisory/ntap-20200918-0001/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-24346?: CVE-2020-24346 is a high-severity vulnerability in F5 Njs, classified under Use After Free. CVSS score: 7.8/10. Published 2020-08-13.
How severe is CVE-2020-24346?: High severity. CVSS v3 base score is 7.8 out of 10.