FKIE_CVE-2020-26569
Vulnerability from fkie_nvd - Published: 2020-12-28 16:15 - Updated: 2026-06-17 03:08
Severity
Summary
In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| arista | eos | * | |
| arista | eos | * | |
| arista | eos | * | |
| arista | eos | * | |
| arista | 7010t-48 | - | |
| arista | 7050cx3-32s | - | |
| arista | 7050cx3m-32s | - | |
| arista | 7050qx-32s | - | |
| arista | 7050qx2-32s | - | |
| arista | 7050sx-128 | - | |
| arista | 7050sx-64 | - | |
| arista | 7050sx-72q | - | |
| arista | 7050sx2-128 | - | |
| arista | 7050sx2-72q | - | |
| arista | 7050sx3-48c8 | - | |
| arista | 7050sx3-48yc | - | |
| arista | 7050sx3-48yc12 | - | |
| arista | 7050sx3-48yc8 | - | |
| arista | 7050sx3-96yc8 | - | |
| arista | 7050tx-48 | - | |
| arista | 7050tx-64 | - | |
| arista | 7050tx-72q | - | |
| arista | 7050tx2-128 | - | |
| arista | 7050tx3-48c8 | - | |
| arista | 7060cx-32s | - | |
| arista | 7060cx2-32s | - | |
| arista | 7060dx4-32 | - | |
| arista | 7060px4-32 | - | |
| arista | 7060sx2-48yc6 | - | |
| arista | 720xp-24y6 | - | |
| arista | 720xp-24zy4 | - | |
| arista | 720xp-48y6 | - | |
| arista | 720xp-48zc2 | - | |
| arista | 720xp-96zc2 | - | |
| arista | 7250qx-64 | - | |
| arista | 7260cx | - | |
| arista | 7260cx3 | - | |
| arista | 7260cx3-64 | - | |
| arista | 7260qx | - | |
| arista | 7300x-32q | - | |
| arista | 7300x-64s | - | |
| arista | 7300x-64t | - | |
| arista | 7300x3-32c | - | |
| arista | 7300x3-48yc4 | - | |
| arista | 7304x3 | - | |
| arista | 7308x3 | - | |
| arista | 7320x-32c | - | |
| arista | 7324x | - | |
| arista | 7328x | - | |
| arista | 7368x4 | - |
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train."
},
{
"lang": "es",
"value": "En unas configuraciones EVPN VxLAN en Arista EOS, los paquetes malformados espec\u00edficos pueden conllevar a enlaces incorrectos de MAC a IP y, como resultado, los paquetes pueden ser reenviados incorrectamente a trav\u00e9s de los l\u00edmites de la VLAN.\u0026#xa0;Esto puede causar que el tr\u00e1fico se descarte en la VLAN receptora.\u0026#xa0;Esto afecta a las versiones: 4.21.12M y versiones inferiores en el tren 4.21.x;\u0026#xa0;4.22.7M y versiones inferiores en el tren 4.22.x;\u0026#xa0;4.23.5M y versiones inferiores en el tren 4.23.x;\u0026#xa0;4.24.2F y versiones inferiores en el tren 4.24.x"
}
],
"id": "CVE-2020-26569",
"lastModified": "2026-06-17T03:08:13.087",
"metrics": {
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{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"exploitabilityScore": 2.2,
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"source": "nvd@nist.gov",
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"published": "2020-12-28T16:15:12.870",
"references": [
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"source": "cve@mitre.org",
"tags": [
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"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/11997-security-advisory-57"
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"value": "NVD-CWE-noinfo"
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}
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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.
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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.
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