What is CVE-2020-24347?

CVE-2020-24347 is a medium-severity vulnerability in F5 Njs, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2020-08-13.

How severe is CVE-2020-24347?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in F5 Njs

CVE-2020-24347

njs through 0.4.3, used in NGINX, has an out-of-bounds read in njs_lvlhsh_level_find in njs_lvlhsh.c.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

F5 Njs

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/nginx/njs/issues/323 (Exploit, Patch, Third Party Advisory, Issue Tracking)
security.netapp.com/advisory/ntap-20200918-0001/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-24347?: CVE-2020-24347 is a medium-severity vulnerability in F5 Njs, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2020-08-13.
How severe is CVE-2020-24347?: Medium severity. CVSS v3 base score is 5.5 out of 10.