High severity · published May 13, 2026
CVE-2026-20916
BIG-IQ iControl REST vulnerability
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
An authenticated iControl REST user with low privileges can create or modify arbitrary files through an undisclosed iControl REST endpoint on the BIG-IQ system.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
BIG-IQ · F5
8.4.0 before 8.4.1 · source: vendor
BC
Big-iq Centralized Management · F5
8.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20916
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20916
Mitigation
https://my.f5.com/manage/s/article/K000158029
More from BIG-IQ
8.8
CVE-2026-66842
BIG-IP and BIG-IQ Configuration utility vulnerability
8.8
CVE-2026-41957
BIG-IP and BIG-IQ Configuration utility vulnerability
8.7
CVE-2026-42406
BIG-IP and BIG-IQ privilege escalation vulnerability
8.7
CVE-2026-32643
BIG-IP and BIG-IQ privilege escalation vulnerability
8.7
CVE-2026-40698
iControl REST and TMSH vulnerability