CVE-2021-31399 - Vulnerability Details - OpenCVE

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.

Published: 2021-08-13

Score: 4.6 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

No analysis available yet.

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 remediation available yet.

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.

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.

The EPSS score is 0.00213.

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

Fri, 30 May 2025 16:15:00 +0000

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

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-08-13T12:05:23.000Z

Updated: 2025-05-30T16:01:46.320Z

Reserved: 2021-04-15T00:00:00.000Z

Link: CVE-2021-31399

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-08-13T13:15:08.380

Modified: 2025-05-30T16:15:27.190

Link: CVE-2021-31399

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-295

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "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": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2025-05-30T16:01:46.320Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"url": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2"}, {"url": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/"}, {"url": "https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31399"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-31399", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "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."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "ADJACENT", "availabilityImpact": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AC:L/AV:A/A:L/C:L/I:N/PR:N/S:U/UI:R", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2", "refsource": "MISC", "url": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2"}, {"name": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/", "refsource": "MISC", "url": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:55:53.746Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-31399", "datePublished": "2021-08-13T12:05:23.000Z", "dateReserved": "2021-04-15T00:00:00.000Z", "dateUpdated": "2025-05-30T16:01:46.320Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:2n:access_unit_2.0_firmware:2.31.0.40.5:*:*:*:*:*:*:*", "matchCriteriaId": "1B23941D-43B0-44F8-9A2B-AE21EC99D392", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:2n:access_unit_2.0:-:*:*:*:*:*:*:*", "matchCriteriaId": "EF27E985-412C-43E7-9518-05F2E6CA5232", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "En los dispositivos 2N Access Unit versi\u00f3n 2.0 2.31.0.40.5, un atacante puede hacerse pasar por el rel\u00e9 web para un ataque de tipo man-in-the-middle."}], "id": "CVE-2021-31399", "lastModified": "2025-05-30T16:15:27.190", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "cve@mitre.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-13T13:15:08.380", "references": [{"source": "cve@mitre.org", "url": "https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31399"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://excellium-services.com/cert-xlm-advisory/cve-2021-31399/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.2n.cz/en_GB/products/ip-access-control/2n-access-unit-2"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "nvd@nist.gov", "type": "Primary"}]}