On BIG-IP version 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.5, and all 12.1.x versions, JS…

published 2021-02-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10091

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

On BIG-IP version 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.5, and all 12.1.x versions, JSON parser function does not protect against out-of-bounds memory accesses or writes. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Patch / fix

fixed in 10

f5 big-ip_access_policy_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_advanced_firewall_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_analytics 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_application_acceleration_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_application_security_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_domain_name_system 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_fraud_protection_service 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_global_traffic_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_link_controller 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1
f5 big-ip_policy_enforcement_manager 13.1.3.5, 14.1.3.1, 15.1.2, 16.0.1.1

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a BIG-IP

Classification

Weakness

CWE-787 Out-of-bounds Write

References

support.f5.com /csp/article/K13323323
vendor-advisory

Sources

CVE List CVE-2021-22973
NVD CVE-2021-22973

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary