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CVE-2020-1999

MEDIUMCVSS 5.3/10EPSS 1.32%

Last modified

CVE-2020-1999 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
1.32%

67.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PaloaltonetworksPan-Os>= 7.1.0, <= 7.1.26
PaloaltonetworksPan-Os>= 8.0.0, <= 8.0.20
PaloaltonetworksPan-Os>= 8.1.0, < 8.1.17
PaloaltonetworksPan-Os>= 9.0.0, < 9.0.11
PaloaltonetworksPan-Os>= 9.1.0, < 9.1.5

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1999?
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.
How severe is CVE-2020-1999?
CVE-2020-1999 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.32% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1999?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1999?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST