CVE-2021-3861
The RNDIS USB device class includes a buffer overflow vulnerability
The RNDIS USB device class includes a buffer overflow vulnerability. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hvfp-w4h8-gxvj
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
The RNDIS USB device class includes a buffer overflow vulnerability
The RNDIS USB device class includes a buffer overflow vulnerability. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hvfp-w4h8-gxvj
- Record
CVE-2021-3861- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2021-27098
The RNDIS USB device class includes a buffer overflow vulnerability. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hvfp-w4h8-gxvj
- Record
EUVD-2021-27098- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H - Updated
- 2026-11-03
NVD
The RNDIS USB device class includes a buffer overflow vulnerability. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hvfp-w4h8-gxvj
- Record
CVE-2021-3861- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H - CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.2 High
AV:L/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-122, CWE-787
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-3861
The RNDIS USB device class includes a buffer overflow vulnerability. Zephyr versions >= v2.6.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hvfp-w4h8-gxvj
- Record
UBUNTU-CVE-2021-3861- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H - CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
zephyrUbuntu:16.04:LTS |
All versions, plus listed versions 3.1.2-13.1.2-1build1 |
None known |
zephyrUbuntu:18.04:LTS |
All versions, plus listed versions 3.1.2-1build13.1.2-1build2 |
None known |
zephyrUbuntu:20.04:LTS |
All versions, plus listed versions 3.1.2-1build3 |
None known |
zephyrUbuntu:22.04:LTS |
All versions, plus listed versions 3.1.2-1build3 |
None known |
zephyrUbuntu:24.04:LTS |
All versions, plus listed versions 3.1.2-1.13.1.2-1.1build1 |
None known |
zephyrUbuntu:25.10 |
All versions, plus listed versions 3.1.2-1.1build1 |
None known |
zephyrUbuntu:26.10 |
All versions, plus listed versions 3.1.2-4 |
None known |
zephyrUbuntu:26.04:LTS |
All versions, plus listed versions 3.1.2-1.1build13.1.2-4 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3861 is a high vulnerability (CVSS 8.2) in Zephyrproject Zephyr, published February 7, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. No source names a fixed version.