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Medium severity5.3NVD Advisory· Published Nov 12, 2020· Updated Jun 17, 2026

CVE-2020-1999

CVE-2020-1999

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Paloaltonetworks/Pan OS3 versions
    cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*range: >=7.1.0,<=7.1.26
    • (no CPE)range: <8.1.17, <9.0.11, <9.1.5, All versions of 7.1 and 8.0
    • (no CPE)range: 7.1.*

Patches

Vulnerability mechanics

References

1

News mentions

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