CVE-2020-1999

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

A vulnerability exists in the Palo Alto Network PAN-OS signature-based threat detection engine that allows an attacker to communicate with devices in the network in a way that is not analyzed for threats by sending data through specifically crafted TCP packets. This technique evades signature-based threat detection. This issue impacts: PAN-OS 8.1 versions earlier than 8.1.17; PAN-OS 9.0 versions earlier than 9.0.11; PAN-OS 9.1 versions earlier than 9.1.5; All versions of PAN-OS 7.1 and PAN-OS 8.0.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-754

Affected software

Vendor	Product	Versions
Palo Alto Networks	PAN-OS	7.1.; 8.0.; >= 8.1, < 8.1.17; >= 9.0, < 9.0.11; >= 9.1, < 9.1.5

References

https://security.paloaltonetworks.com/CVE-2020-1999Vendor Advisory
https://security.paloaltonetworks.com/CVE-2020-1999Vendor Advisory

Timeline

Published: Nov 12, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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