CVE-2020-1999

PAN-OS: Threat signatures are evaded by specifically crafted packets

MEDIUM
5.3
CVSS Score
Published: November 12, 2020 at 12:05 AM UTC
Updated: June 17, 2026 at 03:02 AM UTC
1 product affected across 1 vendorPAN-OS

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

7.1.0 ≤ v ≤ 7.1.268.0.0 ≤ v ≤ 8.0.208.1 ≤ v < 8.1.178.1.0 ≤ v < 8.1.179.0 ≤ v < 9.0.119.0.0 ≤ v < 9.0.119.1 ≤ v < 9.1.59.1.0 ≤ v < 9.1.57.1.*8.0.*8.19.09.1
Vendor states this is fixed in 10.0.* (unaffected)
Affected range stops below 8.1.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.1.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

CVSS

5.3MEDIUMpalo_alto
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754

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