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01 Record

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-middle attack.

MediumPUBLISHEDCNA: mitre
CNA base score4.6 CVSS v3.xCVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R
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02 Description

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.

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.84% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 57.6% of scored records. A rank, not a probability.
NVD base score
5.9 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-08-13 12:05Z5 YR AGO
Last updated
2025-05-30 16:01Z1 YR AGO
Reserved
2021-04-15
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Medium (CVSS 4.6)
CNA CVSS vector
CVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R
Weaknesses
  • CWE-295Improper Certificate ValidationBase
Data version
5.1
Document digest
6946de8692cea02ca1a4cc7cb0e562beeeff1b63d028d6be96a8c06c428e356f

05 Affected products

VendorProductVersionsPlatforms
2naccess_unit_2.0Not specified—
2naccess_unit_2.0_firmwareNot specified—

06 References