CVE-2020-1999

5.3 mediumEPSS 1.3%

Medium (5.3) in paloaltonetworks pan-os. EPSS 1.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.3 medium

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

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-31)
CWE: CWE-754
Published: 2020-11-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

paloaltonetworks:pan-os

References

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

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