Palo Alto Networks Security Advisories / CVE-2016-5696

CVE-2016-5696 Kernel Vulnerability

Severity 4.8 · MEDIUM
Attack Vector NETWORK
Attack Complexity HIGH
Confidentiality Impact NONE
Privileges Required NONE
Integrity Impact LOW
User Interaction NONE
Availability Impact LOW


A vulnerability exists in the kernel of PAN-OS that may result in Information Disclosure. The challenge ACK rate limiting in the kernel's networking subsystem may allow an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. (ref # PAN-62500 / CVE-2016-5696).

Successful exploitation of this issue may allow an attacker to terminate a TCP connection or inject a payload into non-secured TCP connection between two endpoints on the network.

This issue affects PAN-OS 6.1, PAN-OS 7.0.15 and earlier, PAN-OS 7.1.9 and earlier

Product Status

PAN-OS 7.1<= 7.1.9>= 7.1.10
PAN-OS 7.0<= 7.0.15>= 7.0.16
PAN-OS 6.16.1.*

Severity: MEDIUM

CVSSv3.1 Base Score: 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L)

Weakness Type

CWE-200 Information Exposure


PAN-OS 7.0.16 and later, PAN-OS 7.1.10 and later

Workarounds and Mitigations


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