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paloaltoPalo Alto Networks Product Security Incident Response TeamPA-CVE-2020-1999
HistoryNov 11, 2020 - 5:00 p.m.

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

2020-11-1117:00:00
Palo Alto Networks Product Security Incident Response Team
securityadvisories.paloaltonetworks.com
43
palo alto network
threat detection
tcp packets
firewall policies
security features
vulnerability

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

35.9%

A vulnerability exists in the Palo Alto Network PAN-OS signature-based threat detection engine that allows an attacker to evade threat prevention signatures using specifically crafted TCP packets.

This CVE has no impact on the confidentiality and availability of PAN-OS. This issue does not let an attacker access resources blocked by firewall policies and it has no impact on the service availability. There could be an impact on the accuracy of firewall threat prevention with some signatures, but there is no impact on the integrity of other security features.

Work around:
There are no known workarounds for this issue.

Affected configurations

Vulners
Node
softwarepan-osRange<8.1.17
OR
softwarepan-osRange<9.0.11
OR
softwarepan-osRange<9.1.5
OR
softwarepan-os
OR
softwarepan-os
VendorProductVersionCPE
softwarepan-os*cpe:2.3:a:software:pan-os:*:*:*:*:*:*:*:*

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

35.9%

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