CVE-2021-31399

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Published Aug 13, 2021 CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

AND

cpe:2.3:o:2n:access_unit_2.0_firmware:2.31.0.40.5:*:*:*:*:*:*:*

cpe:2.3:h:2n:access_unit_2.0:-:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-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.

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact Low

User Interaction Required

No CVSS v3.0

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.846% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31399
https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/
https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2

History

May 30, 2025 4:15 PM Added references View changes

Type	Values Removed	Values Added
References		https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31399

Subscriptions

2n Access Unit 2.0 Access Unit 2.0 Firmware

Weaknesses

CWE-295

Sources

CVE record Updated: May 30, 2025, 4:01 PM

Status: PUBLISHED
Assigner: mitre
Published: Aug 13, 2021, 12:05 PM
Updated: May 30, 2025, 4:01 PM
Reserved: Apr 15, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 3:51 AM

Status: Modified
Published: Aug 13, 2021, 1:15 PM
Modified: Jun 17, 2026, 3:51 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

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