CVE-2021-46463: f5 njs Type Confusion
CVSS: 9.8v3.1CriticalModified
AliasesALPINE-CVE-2021-46463
Published 14-02-2022Last modified 04-08-2024
Vulnerability summary
CVE-2021-46463 is a critical (CVSS 9.8) Type Confusion vulnerability in f5 njs. EPSS estimates a 1.68% chance of exploitation in the next 30 days, higher than 76.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
1.68%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 14-02-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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().
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.68%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
0.00 pp
From 1.68% on 19-09-2026
19-09-202619-10-2026
EPSS score1.68%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundNjs
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- nginx< 1.20.2-r2
F51 product
- njs≤ 0.7.1
2 vendors · 2 products
References
4 links- github.com/nginx/njs/commit/6a40a85ff239497c6458c7dbef18f6a2736fe992X Refsource MISCPatchThird Party Advisory