CVE-2026-40631: F5 BIG-IP · Exposed Files or Directories
Affects F5 BIG-IPSource CVE Database V5
Not known to be exploited · CVSS 8.7 High · fixed in 21.0.0.2 : patch F5 BIG-IP soon.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 21.0.0.2, 17.5.1.6, 17.1.3.2
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 13 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade F5 BIG-IP to 21.0.0.2, 17.5.1.6 or 17.1.3.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| F5BIG-IP | Affected
| Fixed in
|
AI-suggested
If you cannot patch yet, restrict access to the iControl SOAP interface to trusted administrators only and monitor for unusual configuration changes. Review and limit the assignment of Resource Administrator and Administrator roles to minimize risk.
Description
CVE-2026-40631 is a high-severity vulnerability in F5 BIG-IP affecting versions 16.1.0, 17.1.0, 17.5.0, and 21.0.0. An authenticated attacker with Resource Administrator or Administrator privileges can exploit the iControl SOAP interface to modify configuration objects, leading to privilege escalation.