UpHeron
All vulnerabilities

Servers and applications

CVE-2016-6431

A vulnerability in the local Certificate Authority (CA) feature of Cisco ASA Software before 9.6(1.5) could allow an unauthenticated, remote attacker to cause a reload of the affected system. The vulnerability is due to improper handling of crafted packets during the enrollment operation. An attacker could exploit this vulnerability by sending a crafted enrollment request to the affected system.…

Severity
High 7.5
Published
27 Oct 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.5% in the next 30 daysHigher than 85% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper input validation (CWE-20)
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

A vulnerability in the local Certificate Authority (CA) feature of Cisco ASA Software before 9.6(1.5) could allow an unauthenticated, remote attacker to cause a reload of the affected system. The vulnerability is due to improper handling of crafted packets during the enrollment operation. An attacker could exploit this vulnerability by sending a crafted enrollment request to the affected system. An exploit could allow the attacker to cause the reload of the affected system. Note: Only HTTPS packets directed to the Cisco ASA interface, where the local CA is allowing user enrollment, can be used to trigger this vulnerability. This vulnerability affects systems configured in routed firewall mode and in single or multiple context mode.

From NVD.

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • Version 9.6.1.3
  • Version 9.6.1
  • Version 9.6.0
  • Version 9.5.2.14
All 206 release lines
  • Version 8.0.2.11
  • Version 8.0.2.15
  • Version 8.0.3
  • Version 8.0.3.6
  • Version 8.0.3.12
  • Version 8.0.3.19
  • Version 8.0.4
  • Version 8.0.4.3
  • Version 8.0.4.9
  • Version 8.0.4.16
  • Version 8.0.4.23
  • Version 8.0.4.25
  • Version 8.0.4.28
  • Version 8.0.4.31
  • Version 8.0.4.32
  • Version 8.0.4.33
  • Version 8.0.5
  • Version 8.0.5.20
  • Version 8.0.5.23
  • Version 8.0.5.25
  • Version 8.0.5.27
  • Version 8.0.5.28
  • Version 8.0.5.31
  • Version 8.1.0.104
  • Version 8.1.1
  • Version 8.1.1.6
  • Version 8.1.2
  • Version 8.1.2.13
  • Version 8.1.2.15
  • Version 8.1.2.16
  • Version 8.1.2.19
  • Version 8.1.2.23
  • Version 8.1.2.24
  • Version 8.1.2.49
  • Version 8.1.2.50
  • Version 8.1.2.55
  • Version 8.1.2.56
  • Version 8.2.0.45
  • Version 8.2.1
  • Version 8.2.1.11
  • Version 8.2.2
  • Version 8.2.2.9
  • Version 8.2.2.10
  • Version 8.2.2.12
  • Version 8.2.2.16
  • Version 8.2.2.17
  • Version 8.2.3
  • Version 8.2.4
  • Version 8.2.4.1
  • Version 8.2.4.4
  • Version 8.2.5
  • Version 8.2.5.13
  • Version 8.2.5.22
  • Version 8.2.5.26
  • Version 8.2.5.33
  • Version 8.2.5.40
  • Version 8.2.5.41
  • Version 8.2.5.46
  • Version 8.2.5.48
  • Version 8.2.5.50
  • Version 8.2.5.52
  • Version 8.2.5.55
  • Version 8.2.5.57
  • Version 8.2.5.59
  • Version 8.3.1
  • Version 8.3.1.1
  • Version 8.3.1.4
  • Version 8.3.1.6
  • Version 8.3.2
  • Version 8.3.2.4
  • Version 8.3.2.13
  • Version 8.3.2.23
  • Version 8.3.2.25
  • Version 8.3.2.31
  • Version 8.3.2.33
  • Version 8.3.2.34
  • Version 8.3.2.37
  • Version 8.3.2.39
  • Version 8.3.2.40
  • Version 8.3.2.41
  • Version 8.3.2.44
  • Version 8.4.0
  • Version 8.4.1
  • Version 8.4.1.3
  • Version 8.4.1.11
  • Version 8.4.2
  • Version 8.4.2.1
  • Version 8.4.2.8
  • Version 8.4.3
  • Version 8.4.3.8
  • Version 8.4.3.9
  • Version 8.4.4
  • Version 8.4.4.1
  • Version 8.4.4.3
  • Version 8.4.4.5
  • Version 8.4.4.9
  • Version 8.4.5
  • Version 8.4.5.6
  • Version 8.4.6
  • Version 8.4.7
  • Version 8.4.7.3
  • Version 8.4.7.15
  • Version 8.4.7.22
  • Version 8.4.7.23
  • Version 8.4.7.26
  • Version 8.4.7.28
  • Version 8.4.7.29
  • Version 8.6.1
  • Version 8.6.1.1
  • Version 8.6.1.2
  • Version 8.6.1.5
  • Version 8.6.1.10
  • Version 8.6.1.12
  • Version 8.6.1.13
  • Version 8.6.1.14
  • Version 8.6.1.17
  • Version 9.0.1
  • Version 9.0.2
  • Version 9.0.2.10
  • Version 9.0.3
  • Version 9.0.3.6
  • Version 9.0.3.8
  • Version 9.0.4
  • Version 9.0.4.1
  • Version 9.0.4.5
  • Version 9.0.4.7
  • Version 9.0.4.17
  • Version 9.0.4.20
  • Version 9.0.4.24
  • Version 9.0.4.26
  • Version 9.0.4.29
  • Version 9.0.4.33
  • Version 9.0.4.35
  • Version 9.0.4.37
  • Version 9.0.4.40
  • Version 9.1(7)4
  • Version 9.1(7)6
  • Version 9.1.1
  • Version 9.1.1.4
  • Version 9.1.2
  • Version 9.1.2.8
  • Version 9.1.3
  • Version 9.1.3.2
  • Version 9.1.4
  • Version 9.1.4.5
  • Version 9.1.5
  • Version 9.1.5.10
  • Version 9.1.5.12
  • Version 9.1.5.15
  • Version 9.1.5.21
  • Version 9.1.6
  • Version 9.1.6.1
  • Version 9.1.6.4
  • Version 9.1.6.6
  • Version 9.1.6.8
  • Version 9.1.6.10
  • Version 9.2(0.0)
  • Version 9.2(0.104)
  • Version 9.2(3.1)
  • Version 9.2.1
  • Version 9.2.2
  • Version 9.2.2.4
  • Version 9.2.2.7
  • Version 9.2.2.8
  • Version 9.2.3
  • Version 9.2.3.3
  • Version 9.2.3.4
  • Version 9.2.4
  • Version 9.2.4.2
  • Version 9.2.4.4
  • Version 9.2.4.8
  • Version 9.2.4.10
  • Version 9.3(1.50)
  • Version 9.3(1.105)
  • Version 9.3(2.100)
  • Version 9.3(2.243)
  • Version 9.3.1
  • Version 9.3.1.1
  • Version 9.3.2
  • Version 9.3.2.2
  • Version 9.3.3
  • Version 9.3.3.1
  • Version 9.3.3.2
  • Version 9.3.3.5
  • Version 9.3.3.6
  • Version 9.3.3.9
  • Version 9.3.3.10
  • Version 9.4.0.115
  • Version 9.4.1
  • Version 9.4.1.1
  • Version 9.4.1.2
  • Version 9.4.1.3
  • Version 9.4.1.5
  • Version 9.4.2
  • Version 9.4.2.3
  • Version 9.4.3
  • Version 9.4.3.3
  • Version 9.4.3.4
  • Version 9.5.1
  • Version 9.5.2
  • Version 9.5.2.6
  • Version 9.5.2.10
  • Version 9.5.2.14
  • Version 9.6.0
  • Version 9.6.1
  • Version 9.6.1.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-6431
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-6431