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CVE-2016-5736

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-08-19 · updated 2026-06-17
• Weakness: CWE-284

Description

The default configuration of the IPsec IKE peer listener in F5 BIG-IP LTM, Analytics, APM, ASM, and Link Controller 11.2.1 before HF16, 11.4.x, 11.5.x before 11.5.4 HF2, 11.6.x before 11.6.1, and 12.x before 12.0.0 HF2; BIG-IP AAM, AFM, and PEM 11.4.x, 11.5.x before 11.5.4 HF2, 11.6.x before 11.6.1, and 12.x before 12.0.0 HF2; BIG-IP DNS 12.x before 12.0.0 HF2; BIG-IP Edge Gateway, WebAccelerator, and WOM 11.2.1 before HF16; BIG-IP GTM 11.2.1 before HF16, 11.4.x, 11.5.x before 11.5.4 HF2, and 11.6.x before 11.6.1; and BIG-IP PSM 11.4.0 through 11.4.1 improperly enables the anonymous IPsec IKE peer configuration object, which allows remote attackers to establish an IKE Phase 1 negotiation and possibly conduct brute-force attacks against Phase 2 negotiations via unspecified vectors.

Affected products

• F5 BIG-IP APM: 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+4)
• BIG-IP: 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3 (+3)
• F5 Big-Ip Analytics: 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+4)
• F5 Networks, Inc. BIG-IP (AAM): 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3 (+3)
• BIG-IP ASM: 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+4)
• F5 BIG-IP DNS: 12.0.0
• F5 Big-Ip Edge Gateway: 11.2.1
• F5 Big-Ip Global Traffic Manager: 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+3)
• F5 Big-Ip Link Controller: 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+4)
• F5 BIG-IP (LTM): 11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2 (+4)
• F5 Networks, Inc. BIG-IP (PEM): 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3 (+3)
• F5 Big-Ip Protocol Security Module: 11.4.0, 11.4.1
• F5 Big-Ip Wan Optimization Manager: 11.2.1
• F5 Big-Ip Webaccelerator: 11.2.1
• F5 Big-Ip Websafe: 11.6.0, 12.0.0

References

• http://www.securitytracker.com/id/1036618
• https://support.f5.com/kb/en-us/solutions/public/k/10/sol10133477.html
• http://www.securitytracker.com/id/1036618
• https://support.f5.com/kb/en-us/solutions/public/k/10/sol10133477.html

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