CVE-2021-3031 : Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Ser

Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and PA-7000 Series firewalls are not cleared before the data frame is created. This leaks a small amount of random information from the firewall memory into the Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS firewall is able to collect potentially sensitive information from these packets. This issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001. This issue impacts: PAN-OS 8.1 version earlier than PAN-OS 8.1.18; PAN-OS 9.0 versions earlier than PAN-OS 9.0.12; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5.

Published 2021-01-13 18:15:15

Updated 2022-10-27 12:51:31

Source Palo Alto Networks, Inc.

View at NVD, CVE.org

Vulnerability category: Information leak

Products affected by CVE-2021-3031

Paloaltonetworks » Pan-os
Versions from including (>=) 8.1.0 and before (<) 8.1.18
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
Matching versions
When used together with: Paloaltonetworks » Pa-200 » Version: N/A
When used together with: Paloaltonetworks » Pa-2020 » Version: N/A
When used together with: Paloaltonetworks » Pa-2050 » Version: N/A
When used together with: Paloaltonetworks » Pa-220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3020 » Version: N/A
When used together with: Paloaltonetworks » Pa-3050 » Version: N/A
When used together with: Paloaltonetworks » Pa-3060 » Version: N/A
When used together with: Paloaltonetworks » Pa-3220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3250 » Version: N/A
When used together with: Paloaltonetworks » Pa-3260 » Version: N/A
When used together with: Paloaltonetworks » Pa-500 » Version: N/A
When used together with: Paloaltonetworks » Pa-5200 » Version: N/A
When used together with: Paloaltonetworks » Pa-800 » Version: N/A
Paloaltonetworks » Pan-os
Versions from including (>=) 9.1.0 and before (<) 9.1.5
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
Matching versions
When used together with: Paloaltonetworks » Pa-200 » Version: N/A
When used together with: Paloaltonetworks » Pa-2020 » Version: N/A
When used together with: Paloaltonetworks » Pa-2050 » Version: N/A
When used together with: Paloaltonetworks » Pa-220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3020 » Version: N/A
When used together with: Paloaltonetworks » Pa-3050 » Version: N/A
When used together with: Paloaltonetworks » Pa-3060 » Version: N/A
When used together with: Paloaltonetworks » Pa-3220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3250 » Version: N/A
When used together with: Paloaltonetworks » Pa-3260 » Version: N/A
When used together with: Paloaltonetworks » Pa-500 » Version: N/A
When used together with: Paloaltonetworks » Pa-5200 » Version: N/A
When used together with: Paloaltonetworks » Pa-800 » Version: N/A
Paloaltonetworks » Pan-os
Versions from including (>=) 9.0.0 and before (<) 9.0.12
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
Matching versions
When used together with: Paloaltonetworks » Pa-200 » Version: N/A
When used together with: Paloaltonetworks » Pa-2020 » Version: N/A
When used together with: Paloaltonetworks » Pa-2050 » Version: N/A
When used together with: Paloaltonetworks » Pa-220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3020 » Version: N/A
When used together with: Paloaltonetworks » Pa-3050 » Version: N/A
When used together with: Paloaltonetworks » Pa-3060 » Version: N/A
When used together with: Paloaltonetworks » Pa-3220 » Version: N/A
When used together with: Paloaltonetworks » Pa-3250 » Version: N/A
When used together with: Paloaltonetworks » Pa-3260 » Version: N/A
When used together with: Paloaltonetworks » Pa-500 » Version: N/A
When used together with: Paloaltonetworks » Pa-5200 » Version: N/A
When used together with: Paloaltonetworks » Pa-800 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-3031

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 23 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3031

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.3	LOW	AV:A/AC:L/Au:N/C:P/I:N/A:N	6.5	2.9	NIST
Access Vector: Adjacent Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
4.3	MEDIUM	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	2.8	1.4	Palo Alto Networks, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None

CWE ids for CVE-2021-3031

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: psirt@paloaltonetworks.com (Secondary)
CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer

The product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-3031

https://security.paloaltonetworks.com/CVE-2021-3031

CVE-2021-3031 PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)
Vendor Advisory

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Vulnerability Details : CVE-2021-3031

Products affected by CVE-2021-3031

Exploit prediction scoring system (EPSS) score for CVE-2021-3031

CVSS scores for CVE-2021-3031

CWE ids for CVE-2021-3031

References for CVE-2021-3031