F5 BIG-IP Missing Authentication Vulnerability
On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior to 13.1.5, and all 12.1.x and 11.6.x versions, undisclosed requests may bypass iControl REST…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)10 May 2022
- Exploited in EUVD (ENISA)10 May 2022
- Used by ransomwareyes
- EPSS above 10 %99.95%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior to 13.1.5, and all 12.1.x and 11.6.x versions, undisclosed requests may bypass iControl REST authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated
Affected products
- 14.1.x <14.1.4.6
- 13.1.x <13.1.5
- 12.1.x ≤12.1.6
- 15.1.x <15.1.5.1
- 16.1.x <16.1.2.2
- 11.6.x ≤11.6.5
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 99.95%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-94127F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability6.9 · Actively exploited
- CVE-2025-53521F5 BIG-IP Stack-Based Buffer Overflow Vulnerability5.6 · Background exploitation
- CVE-2023-46748F5 BIG-IP Configuration Utility SQL Injection Vulnerability4.8 · Background exploitation
- CVE-2023-46747F5 BIG-IP Configuration Utility Authentication Bypass Vulnerability9.8 · Background exploitation
- CVE-2021-22991F5 BIG-IP Traffic Management Microkernel Buffer Overflow8.2 · Background exploitation
- CVE-2021-22986F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution Vulnerability9.9 · Background exploitation