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5.3 Medium

CVE-2020-1999 A vulnerability exists in the Palo Alto Network PAN-OS signature-based threat detection engine that allows an attacker…

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.

Affected products and versions

Product Affected versions Fixed in
PAN-OS 9.1 9.1 → < 9.1.5 9.1.5
PAN-OS 9.0 9.0 → < 9.0.11 9.0.11
PAN-OS 8.1 8.1 → < 8.1.17 8.1.17

Other CVEs of PAN-OS

The 197 CVEs of PAN-OS →
CVE-2026-0316 A stored cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious… 1.1 Low CVE-2026-0317 A denial of service vulnerability in Palo Alto Networks PAN-OS software enables an authenticated user with a read-only… 1.2 Low CVE-2026-0318 A stack-based buffer overflow vulnerability in the log processing functionality of Palo Alto Networks PAN-OS® software… 4.6 Medium CVE-2026-0319 An improper input handling vulnerability in the GlobalProtect™ gateway of Palo Alto Networks PAN-OS software enables… 4.9 Medium
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