CVE-2021-31399
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the...
CVE-2021-31399 is a medium vulnerability (CVSS 4.6) in 2n Access Unit 2.0 Firmware, published August 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. No source names a fixed version.
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.
- Record
CVE-2021-31399- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R - Updated
- 2026-11-02
EUVDEUVD-2021-18309
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.
- Record
EUVD-2021-18309- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c9p5-2jv2-63vv
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the...
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.
- Record
GHSA-c9p5-2jv2-63vv- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
NVD
On 2N Access Unit 2.0 2.31.0.40.5 devices, an attacker can pose as the web relay for a man-in-the-middle attack.
- Record
CVE-2021-31399- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD |