What is CVE-2021-46463?

CVE-2021-46463 is a critical-severity vulnerability in F5 Njs, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2022-02-14.

How severe is CVE-2021-46463?

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

Vulnerability in F5 Njs

CVE-2021-46463

njs through 0.7.1, used in NGINX, was discovered to contain a control flow hijack caused by a Type Confusion vulnerability in njs_promise_perform_then().

Published 2022-02-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.000

Affected products

F5 Njs

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

github.com/nginx/njs/issues/447 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/nginx/njs/commit/6a40a85ff239497c6458c7dbef18f6a2736fe992 (Patch, Third Party Advisory)
security.netapp.com/advisory/ntap-20220303-0007/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-46463?: CVE-2021-46463 is a critical-severity vulnerability in F5 Njs, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.8/10. Published 2022-02-14.
How severe is CVE-2021-46463?: Critical severity. CVSS v3 base score is 9.8 out of 10.