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TI-2021-02169 Aliases CVE-2021-3031GHSA-v97c-wm3x-xr3x

PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)

Priority LOW 21CWE-200Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

EPSS 0.00549 46th percentileScored 2026-11-08
Fix Fixed PAN-OS (Palo Alto Networks): 8.1.18, 9.0.12, 9.1.5

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Palo Alto NetworksPAN-OS8.1 to before 8.1.18; 9.0 to before 9.0.12; 9.1 to before 9.1.58.1.18, 9.0.12, 9.1.5Patch availableCNA
Palo Alto NetworksPAN-OS—8.1.18, 9.0.12, 9.1.5Patch availableCNA
  • PAN-OS VendorPalo Alto Networks Affected 8.1 to before 8.1.18; 9.0 to before 9.0.12; 9.1 to before 9.1.5 Fixed in 8.1.18, 9.0.12, 9.1.5 Patch available CNA
  • PAN-OS VendorPalo Alto Networks Affected — Fixed in 8.1.18, 9.0.12, 9.1.5 Patch available CNA

CPE configurations NVD · 14

CPEVersionsRoleVendor
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*8.1.0 to before 8.1.18; 9.0.0 to before 9.0.12; 9.1.0 to before 9.1.5VulnerableCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-200:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-2020:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-2050:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-220:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-3020:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-3050:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-3060:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-3220:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-3250:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
Show 4 more CPE
CPEVersionsRoleVendor
cpe:2.3:h:paloaltonetworks:pa-3260:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-500:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-5200:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company
cpe:2.3:h:paloaltonetworks:pa-800:-:*:*:*:*:*:*:*not specified by NVDRunning onCyberArk Software, a Palo Alto Networks Company

Remediation

  • Fix · CNA PAN-OS (Palo Alto Networks) Fixed in 8.1.18, 9.0.12, 9.1.5
  • Fix · CNA PAN-OS (Palo Alto Networks) Fixed in 8.1.18, 9.0.12, 9.1.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3031
  2. 2026-10-03 Alias added: GHSA-v97c-wm3x-xr3x

References

Advisory 1

  • TI-2024-08782 Expedition: Unauthenticated OS Command Injection Vulnerability Leads to Firewall Credential Disclosure KEVCVSS 4.0CRITICAL 9.9
  • TI-2024-03172 PAN-OS: Arbitrary File Creation Leads to OS Command Injection Vulnerability in GlobalProtect KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01936 PAN-OS: Authentication Bypass in SAML Authentication KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-11675 Palo Alto Networks PAN-OS before 6.1.19, 7.0.x before 7.0.19, 7.1.x before 7.1.14, and… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00239 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal KEVCVSS 4.0CRITICAL 9.3
  • TI-2024-08784 Expedition: SQL Injection Leads to Firewall Admin Credential Disclosure KEVCVSS 4.0CRITICAL 9.2
See all 367 →

Sources

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