CVE-2026-73451 (GCVE-0-2026-73451)
Vulnerability from cvelistv5 – Published: 2026-09-15 18:12 – Updated: 2026-09-15 19:24
VLAI
EPSS
VEX
Title
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can
Summary
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 19:24 UTC
CWE
- CWE-1419 - Incorrect Initialization of Resource
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.36.0 , ≤ 4.36.0.1F
(custom)
Affected: 4.35.0 , ≤ 4.35.4M (custom) Affected: 4.34.0 , ≤ 4.34.6M (custom) Affected: 4.33.0 , ≤ 4.33.8M (custom) Affected: 4.32.0 , ≤ 4.32.11M (custom) Affected: 4.31.1F , ≤ 4.31.10M (custom) |
guessed |
Date Public
2026-09-09 18:10
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"value": "\u003cpre\u003e\u003cp\u003eIn order to be vulnerable to CVE-2026-73451, the following condition must be met:\u003c/p\u003e\u003cp\u003eSecurity ACL must be configured on SVI in ingress direction, which by default uses a shared ACL identifier. In the example below RACLID = 1 for both switchcards:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show run interface vlan\ninterface Vlan100\n\u0026nbsp;\u0026nbsp;\u0026nbsp;ip access-group acl1 in\n \nswitch\u0026gt;show platform trident tcam acl\u0026nbsp;\n=== IP ACLs on switch SwitchcardCes1/0 ===\n \nINGRESS ACL acl1 uses 2 entries\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to VLANs: 100\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Shared ACL Identifier (RACLID): 1\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to ports: None\n \n=== MAC ACLs on switch SwitchcardCes1/0 ===\n \n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\n \n=== IP ACLs on switch SwitchcardCes2/0 ===\n \nINGRESS ACL acl1 uses 2 entries\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to VLANs: 100\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Shared ACL Identifier (RACLID): 1\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to ports: None\n \n=== MAC ACLs on switch SwitchcardCes2/0 ===\n \n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf Security ACL is \u003cb\u003enot\u003c/b\u003e configured on SVI in ingress direction, there is no exposure to this issue and the message will look something like:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show run interface vlan\ninterface Vlan100\n \nswitch\u0026gt;show platform trident tcam acl\n=== IP ACLs on switch SwitchcardCes1/0 ===\n \n=== MAC ACLs on switch SwitchcardCes1/0 ===\n \n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\n \n=== IP ACLs on switch SwitchcardCes2/0 ===\n \n=== MAC ACLs on switch SwitchcardCes2/0 ===\n \n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\u003c/pre\u003e\u003c/pre\u003e"
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"value": "\u003cpre\u003eOn affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.\n\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\n\u003c/pre\u003e"
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"title": "On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can",
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-73451\",\"sourceIdentifier\":\"psirt@arista.com\",\"published\":\"2026-09-15T19:17:38.960\",\"lastModified\":\"2026-09-15T20:17:42.610\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.\\n\\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\"}],\"affected\":[{\"source\":\"psirt@arista.com\",\"affectedData\":[{\"vendor\":\"Arista Networks\",\"product\":\"EOS\",\"defaultStatus\":\"unaffected\",\"platforms\":[\"755 Series\",\"758 Series\"],\"versions\":[{\"version\":\"4.36.0\",\"lessThanOrEqual\":\"4.36.0.1F\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.35.0\",\"lessThanOrEqual\":\"4.35.4M\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.34.0\",\"lessThanOrEqual\":\"4.34.6M\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.33.0\",\"lessThanOrEqual\":\"4.33.8M\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.32.0\",\"lessThanOrEqual\":\"4.32.11M\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.31.1F\",\"lessThanOrEqual\":\"4.31.10M\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"psirt@arista.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":6.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"psirt@arista.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":2.5}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-15T19:24:36.704643Z\",\"id\":\"CVE-2026-73451\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"references\":[{\"url\":\"https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151\",\"source\":\"psirt@arista.com\"}]}}",
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-73451\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-15T19:24:36.704643Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-15T19:24:39.313Z\"}}], \"cna\": {\"title\": \"On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can\", \"source\": {\"defect\": [\"1262274\"], \"defects\": [\"BUG 1262274\"], \"advisory\": \"Security Advisory 0151\", \"discovery\": \"INTERNAL\"}, \"impacts\": [{\"capecId\": \"CAPEC-180\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-180 Exploiting Incorrectly Configured Access Control Security Levels\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Arista Networks\", \"product\": \"EOS\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.36.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.36.0.1F\"}, {\"status\": \"affected\", \"version\": \"4.35.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.35.4M\"}, {\"status\": \"affected\", \"version\": \"4.34.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.34.6M\"}, {\"status\": \"affected\", \"version\": \"4.33.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.33.8M\"}, {\"status\": \"affected\", \"version\": \"4.32.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.32.11M\"}, {\"status\": \"affected\", \"version\": \"4.31.1F\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.31.10M\"}], \"platforms\": [\"755 Series\", \"758 Series\"], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"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.\\n\\nCVE-2026-73451 has been fixed in the following releases:\\n* 4.36.1F and later releases in the 4.36.x train.\\n* 4.35.5M and later releases in the 4.35.x train.\\n* 4.34.7M and later releases in the 4.34.x train.\\n* 4.33.9M and later releases in the 4.33.x train.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003e\\nThe 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.\\n\\nCVE-2026-73451 has been fixed in the following releases:\\n* 4.36.1F and later releases in the 4.36.x train.\\n* 4.35.5M and later releases in the 4.35.x train.\\n* 4.34.7M and later releases in the 4.34.x train.\\n* 4.33.9M and later releases in the 4.33.x train.\\n\u003c/pre\u003e\", \"base64\": false}]}], \"datePublic\": \"2026-09-09T18:10:00.000Z\", \"references\": [{\"url\": \"https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"The workaround is to re-configure (remove and reapply) the ingress IPv4 and IPv6 ACLs applied to all SVIs.\\n\\n\\n\\nFor every SVI check the active ACL(s) applied to it,\\n\\n\\n\\nswitch(config)# interface VlanNNN\\nswitch(config-if-VlNNN)# show active\\n\\n\\n\\u00a0\\n\\n\\n\\nThen remove the ACL(s) and re-apply them,\\n\\n\\n\\nswitch(config-if-VlNNN)# no ip access-group \u003cacl name\u003e in\\nswitch(config-if-VlNNN)# ip access-group \u003cacl name\u003e in\\nswitch(config-if-VlNNN)# no ipv6 access-group \u003cacl name\u003e in\\nswitch(config-if-VlNNN)# ipv6 access-group \u003cacl name\u003e in\\n\\n\\n\\u00a0\\n\\n\\n\\nNote: the security provided by the ACL configuration will not be present during the removal/reapplication of the security ACLs.\\n\\n\\n\\nFor more information about Security ACLs see EOS User Manual: ACLs and Route Maps https://www.arista.com/en/um-eos/eos-acls-and-route-maps .\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003e\u003cp\u003eThe workaround is to re-configure (remove and reapply) the ingress IPv4 and IPv6 ACLs applied to all SVIs.\u003c/p\u003e\u003cp\u003eFor every SVI check the active ACL(s) applied to it,\u003c/p\u003e\u003cpre\u003eswitch(config)# interface Vlan\u003ci\u003eNNN\u003c/i\u003e\\nswitch(config-if-Vl\u003ci\u003eNNN\u003c/i\u003e)# show active\\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eThen remove the ACL(s) and re-apply them,\u003c/p\u003e\u003cpre\u003eswitch(config-if-Vl\u003ci\u003eNNN\u003c/i\u003e)# no ip access-group \u0026lt;acl name\u0026gt; in\\nswitch(config-if-Vl\u003ci\u003eNNN\u003c/i\u003e)# ip access-group \u0026lt;acl name\u0026gt; in\\nswitch(config-if-Vl\u003ci\u003eNNN\u003c/i\u003e)# no ipv6 access-group \u0026lt;acl name\u0026gt; in\\nswitch(config-if-Vl\u003ci\u003eNNN\u003c/i\u003e)# ipv6 access-group \u0026lt;acl name\u0026gt; in\\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eNote: the security provided by the ACL configuration will not be present during the removal/reapplication of the security ACLs.\u003c/p\u003e\u003cp\u003eFor more information about Security ACLs see \u003ca href=\\\"https://www.arista.com/en/um-eos/eos-acls-and-route-maps\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\"\u003eEOS User Manual: ACLs and Route Maps\u003c/a\u003e.\u003c/p\u003e\u003c/pre\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.5\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.\\n\\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003eOn affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.\\n\\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\\n\u003c/pre\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1419\", \"description\": \"CWE-1419 Incorrect Initialization of Resource\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"In order to be vulnerable to CVE-2026-73451, the following condition must be met:\\n\\n\\n\\nSecurity ACL must be configured on SVI in ingress direction, which by default uses a shared ACL identifier. In the example below RACLID = 1 for both switchcards:\\n\\n\\n\\nswitch\u003eshow run interface vlan\\ninterface Vlan100\\n\\u00a0\\u00a0\\u00a0ip access-group acl1 in\\n \\nswitch\u003eshow platform trident tcam acl\\u00a0\\n=== IP ACLs on switch SwitchcardCes1/0 ===\\n \\nINGRESS ACL acl1 uses 2 entries\\n\\u00a0\\u00a0\\u00a0\\u00a0Assigned to VLANs: 100\\n\\u00a0\\u00a0\\u00a0\\u00a0Shared ACL Identifier (RACLID): 1\\n\\u00a0\\u00a0\\u00a0\\u00a0Assigned to ports: None\\n \\n=== MAC ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IP ACLs on switch SwitchcardCes2/0 ===\\n \\nINGRESS ACL acl1 uses 2 entries\\n\\u00a0\\u00a0\\u00a0\\u00a0Assigned to VLANs: 100\\n\\u00a0\\u00a0\\u00a0\\u00a0Shared ACL Identifier (RACLID): 1\\n\\u00a0\\u00a0\\u00a0\\u00a0Assigned to ports: None\\n \\n=== MAC ACLs on switch SwitchcardCes2/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\\n\\n\\n\\u00a0\\n\\n\\n\\nIf Security ACL is not configured on SVI in ingress direction, there is no exposure to this issue and the message will look something like:\\n\\n\\n\\nswitch\u003eshow run interface vlan\\ninterface Vlan100\\n \\nswitch\u003eshow platform trident tcam acl\\n=== IP ACLs on switch SwitchcardCes1/0 ===\\n \\n=== MAC ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IP ACLs on switch SwitchcardCes2/0 ===\\n \\n=== MAC ACLs on switch SwitchcardCes2/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003e\u003cp\u003eIn order to be vulnerable to CVE-2026-73451, the following condition must be met:\u003c/p\u003e\u003cp\u003eSecurity ACL must be configured on SVI in ingress direction, which by default uses a shared ACL identifier. In the example below RACLID = 1 for both switchcards:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show run interface vlan\\ninterface Vlan100\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;ip access-group acl1 in\\n \\nswitch\u0026gt;show platform trident tcam acl\u0026nbsp;\\n=== IP ACLs on switch SwitchcardCes1/0 ===\\n \\nINGRESS ACL acl1 uses 2 entries\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to VLANs: 100\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Shared ACL Identifier (RACLID): 1\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to ports: None\\n \\n=== MAC ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IP ACLs on switch SwitchcardCes2/0 ===\\n \\nINGRESS ACL acl1 uses 2 entries\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to VLANs: 100\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Shared ACL Identifier (RACLID): 1\\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Assigned to ports: None\\n \\n=== MAC ACLs on switch SwitchcardCes2/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf Security ACL is \u003cb\u003enot\u003c/b\u003e configured on SVI in ingress direction, there is no exposure to this issue and the message will look something like:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show run interface vlan\\ninterface Vlan100\\n \\nswitch\u0026gt;show platform trident tcam acl\\n=== IP ACLs on switch SwitchcardCes1/0 ===\\n \\n=== MAC ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes1/0 ===\\n \\n=== IP ACLs on switch SwitchcardCes2/0 ===\\n \\n=== MAC ACLs on switch SwitchcardCes2/0 ===\\n \\n=== IPv6 ACLs on switch SwitchcardCes2/0 ===\u003c/pre\u003e\u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"shortName\": \"Arista\", \"dateUpdated\": \"2026-09-15T18:12:44.908Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-73451\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T19:24:42.924Z\", \"dateReserved\": \"2026-08-12T16:42:47.921Z\", \"assignerOrgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"datePublished\": \"2026-09-15T18:12:44.908Z\", \"assignerShortName\": \"Arista\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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.
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