CVE-2021-3031
4.3 MEDIUMPadding 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 ...
Published: 2021-01-13 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 4.3 MEDIUM
- Vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CWE
- CWE-200, CWE-212
Affected products
| Vendor | Product |
|---|---|
| paloaltonetworks | pan-os |
Description
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-3031
- [Vendor advisory]https://security.paloaltonetworks.com/CVE-2021-3031
- [Vendor advisory]https://security.paloaltonetworks.com/CVE-2021-3031
Related CVEs
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- CVE-2026-0257 — Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker ... (9.1 CRITICAL)
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- CVE-2021-3057 — A stack-based buffer overflow vulnerability exists in the Palo Alto Networks GlobalProtect app that enables a man-in-the-middle attacker ... (8.1 HIGH)
- CVE-2021-3055 — An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an au... (6.5 MEDIUM)
- CVE-2021-3054 — A time-of-check to time-of-use (TOCTOU) race condition vulnerability in the Palo Alto Networks PAN-OS web interface enables an authentica... (7.2 HIGH)
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