CVE-2021-46463
CVE-2021-46463 is a critical-severity vulnerability in F5 Njs with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-843.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 2% (74th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-843
- Affected product: F5 Njs
- Published:
- Last modified:
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().
Frequently asked questions
- What is 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().
- How severe is CVE-2021-46463?
- CVE-2021-46463 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-46463 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-46463?
- CVE-2021-46463 affects F5 Njs. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-46463?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-46463 published?
- CVE-2021-46463 was published on 2022-02-14 and last updated on 2026-06-17.
References
- https://github.com/nginx/njs/commit/6a40a85ff239497c6458c7dbef18f6a2736fe992
- https://github.com/nginx/njs/issues/447
- https://security.netapp.com/advisory/ntap-20220303-0007/
Affected products (1)
- cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:*
More vulnerabilities in F5 Njs
- CVE-2020-19695 — Critical (CVSS 9.8): Buffer Overflow found in Nginx NJS allows a remote attacker to execute arbitrary code via the njs_object_property…
- CVE-2020-19692 — Critical (CVSS 9.8): Buffer Overflow vulnerabilty found in Nginx NJS v.0feca92 allows a remote attacker to execute arbitrary code via the…
- CVE-2022-43286 — Critical (CVSS 9.8): Nginx NJS v0.7.2 was discovered to contain a heap-use-after-free bug caused by illegal memory copy in the function…
- CVE-2022-29379 — Critical (CVSS 9.8): Nginx NJS v0.7.3 was discovered to contain a stack overflow in the function njs_default_module_loader at…
- CVE-2022-27007 — Critical (CVSS 9.8): nginx njs 0.7.2 is affected suffers from Use-after-free in njs_function_frame_alloc() when it try to invoke from a…
- CVE-2022-25139 — Critical (CVSS 9.8): njs through 0.7.0, used in NGINX, was discovered to contain a heap use-after-free in njs_await_fulfilled.
Other CWE-843 vulnerabilities
- CVE-2021-33970 — Critical (CVSS 10.0): Buffer Overflow vulnerability in Qihoo 360 Chrome v13.0.2170.0 allows attacker to escalate priveleges.
- CVE-2010-2299 — Critical (CVSS 10.0): The Clipboard::DispatchObject function in app/clipboard/clipboard.cc in Google Chrome before 5.0.375.70 does not…
- CVE-2023-22579 — Critical (CVSS 9.9): Due to improper parameter filtering in the sequalize js library, can a attacker peform injection.
- CVE-2026-13776 — Critical (CVSS 9.8): Type Confusion in Dawn in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
- CVE-2026-43038 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: ipv6: icmp: clear skb2->cb[] in…
- CVE-2025-70023 — Critical (CVSS 9.8): An issue pertaining to CWE-843: Access of Resource Using Incompatible Type was discovered in transloadit uppy v0.25.6.