CVE-2023-5502 (GCVE-0-2023-5502)
Vulnerability from cvelistv5 – Published: 2026-06-04 22:39 – Updated: 2026-06-05 18:30
VLAI
EPSS
VEX
Title
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, a malicious supplicant may bypass authentication.
Summary
On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-05 18:30 UTC
CWE
- CWE-287 - Improper Authentication
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.31.0 , ≤ 4.31.0F
(custom)
Affected: 4.30.0 , ≤ 4.30.4M (custom) Affected: 4.29.0 , ≤ 4.29.6M (custom) Affected: 4.28.0 , ≤ 4.28.8M (custom) Affected: 4.27.0 , ≤ 4.27.11M (custom) Affected: 4.26.0 , ≤ 4.26.11M (custom) Affected: 4.25.0 , ≤ 4.25.11M (custom) Affected: 4.24.0 , ≤ 4.24.11M (custom) |
guessed |
Date Public
2024-05-21 16:00
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"value": "In order to be vulnerable to CVE-2023-5502, either of the following configuration conditions must be met:\n\nCondition 1: Dot1x authentication must be configured:\n\ndot1x system-auth-control\ninterface Ethernet1\n dot1x pae authenticator\n dot1x port-control auto\n !! One of the two configuration lines below MUST be set\n dot1x host-mode single-host\n dot1x host-mode multi-host authenticated\ninterface Vlan100\n ip address 1.1.1.1/24\n ip routing\n\nCondition 2: 802.1x configured in any host mode with MBA:\n\ndot1x system-auth-control\ninterface Ethernet1\n dot1x pae authenticator\n dot1x port-control auto\n dot1x mac based authentication\n !! One of the three configuration lines below MUST be set\n dot1x host-mode single-host\n dot1x host-mode multi-host authenticated\n dot1x host-mode multi-host\ninterface Vlan100\n ip address 1.1.1.1/24\n ip routing"
}
],
"datePublic": "2024-05-21T16:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cspan\u003eOn affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication.\u003c/span\u003e\u003cbr\u003e"
}
],
"value": "On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, and routing enabled on the access VLAN of the ports, a malicious supplicant may be able to bypass the requirement to perform 802.1x authentication."
}
],
"impacts": [
{
"capecId": "CAPEC-115",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-115 Authentication Bypass"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV3_1": {
"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"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "CWE-287 Improper Authentication",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-04T22:39:34.101Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/19462-security-advisory-0096"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\u003cbr\u003eFor more information about upgrading see \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades\"\u003eEOS User Manual: Upgrades and Downgrades\u003c/a\u003e\u003c/p\u003e\u003cdiv\u003eCVE-2023-5502 has been fixed in the following releases:\u003c/div\u003e\u003cul\u003e\u003cli\u003e4.32.0F and later releases in the 4.32.x train\u003c/li\u003e\u003cli\u003e4.31.3M and later releases in the 4.31.x train\u003c/li\u003e\u003cli\u003e4.30.5M and later releases in the 4.30.x train\u003c/li\u003e\u003cli\u003e4.29.7M and later releases in the 4.29.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eNote: Products 7280E and 7500E are EOL, and there are no released versions of EOS which fix the issue on those platforms.\u003c/p\u003e"
}
],
"value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\nFor more information about upgrading see EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades \n\nCVE-2023-5502 has been fixed in the following releases:\n * 4.32.0F and later releases in the 4.32.x train\n * 4.31.3M and later releases in the 4.31.x train\n * 4.30.5M and later releases in the 4.30.x train\n * 4.29.7M and later releases in the 4.29.x train\n\nNote: Products 7280E and 7500E are EOL, and there are no released versions of EOS which fix the issue on those platforms."
}
],
"source": {
"advisory": "0096",
"defect": [
"BUG 862986"
],
"discovery": "INTERNAL"
},
"title": "On affected platforms running Arista EOS with 802.1x authentication configured on the access/trunk ports, a malicious supplicant may bypass authentication.",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eMitigation of this vulnerability requires disabling dot1x. Dot1x can be disabled globally using the following command:\u003c/p\u003e\u003cpre\u003eno dot1x system-auth-control\u003c/pre\u003e"
}
],
"value": "Mitigation of this vulnerability requires disabling dot1x. Dot1x can be disabled globally using the following command:\n\nno dot1x system-auth-control"
}
],
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2023-5502",
"datePublished": "2026-06-04T22:39:34.101Z",
"dateReserved": "2023-10-10T15:58:04.589Z",
"dateUpdated": "2026-06-05T18:30:54.241Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.