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Servers and applications

CVE-2016-5736

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,…

Severity
High 7.5
Published
19 Aug 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.3% in the next 30 daysHigher than 83% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper access control (CWE-284)
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

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.

From NVD.

Affected software

SoftwareAffected versions
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_access_policy_manager
  • Version 12.0.0
  • Version 11.6.0
  • Version 11.5.4
  • Version 11.5.3
All 10 release lines
  • Version 11.2.1
  • Version 11.4.0
  • Version 11.4.1
  • Version 11.5.0
  • Version 11.5.1
  • Version 11.5.2
  • Version 11.5.3
  • Version 11.5.4
  • Version 11.6.0
  • Version 12.0.0
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_local_traffic_manager
  • Version 12.0.0
  • Version 11.6.0
  • Version 11.5.4
  • Version 11.5.3
All 10 release lines
  • Version 11.2.1
  • Version 11.4.0
  • Version 11.4.1
  • Version 11.5.0
  • Version 11.5.1
  • Version 11.5.2
  • Version 11.5.3
  • Version 11.5.4
  • Version 11.6.0
  • Version 12.0.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-5736
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-5736