Use After Free in F5 Njs

CVE-2020-24349

njs through 0.4.3, used in NGINX, allows control-flow hijack in njs_value_property in njs_value.c. NOTE: the vendor considers the issue to be "fluff" in the NGINX use case because there is no remote attack surface.

Vulnerability class: Use-After-Free

EPSS: 0.005 (42.0th percentile) — read the EPSS interpretation.

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:H/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (Exploit, Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
  • cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2020-24349?
CVE-2020-24349 is a medium-severity vulnerability in F5 Njs, classified under Use After Free. CVSS score: 5.5/10. Published 2020-08-13.
How severe is CVE-2020-24349?
Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-24349 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.