CVE-2026-73458 (GCVE-0-2026-73458)
Vulnerability from cvelistv5 – Published: 2026-09-15 19:30 – Updated: 2026-09-15 19:38
VLAI
EPSS
VEX
Title
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou
Summary
On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 19:38 UTC
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.arista.com/en/support/advisories-noti… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.36.0 , ≤ 4.36.1F
(custom)
Affected: 4.35.0 , ≤ 4.35.5M (custom) Affected: 4.34.0 , ≤ 4.34.7M (custom) Affected: 4.33.0 , ≤ 4.33.8M (custom) |
guessed |
Date Public
2026-09-09 19:27
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"7368X4 Series",
"7388X5 Series",
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"value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73458, the following condition must be met:\u003c/p\u003e\u003cdiv\u003eBFD sessions configured with authentication are affected by this issue. All supported authentication modes are impacted. The full list of authentication modes is below:\u003c/div\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cul\u003e\u003cli\u003ePassword\u003c/li\u003e\u003cli\u003eKeyed MD5\u003c/li\u003e\u003cli\u003eMeticulous MD5\u003c/li\u003e\u003cli\u003eKeyed SHA1\u003c/li\u003e\u003cli\u003eMeticulous SHA1\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eTo determine whether your sessions are affected, run the following show command. If the authentication mode is set to anything other than None, your configuration is impacted. In the example below, the authentication mode is set to Password, indicating an affected configuration.\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async Off, Echo Off\nLast Up 06/04/26 13:55:50.630\nLast Down 06/04/26 13:55:49.725\nLast Diag: No Diagnostic\nAuthentication mode: Password\nShared-secret profile: bfdProfile_0\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 2308, Rx Interval (ms) min/max/avg: 81/538/438 last: 188 ms ago\nTx Count: 2206, Tx Interval (ms) min/max/avg: 380/516/458 last: 476 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 1762, 2*TxInt: 443, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 16:51.08\nLast packet:\u0026nbsp; Version: 1 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Diagnostic: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;State bit: Up\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Demand bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Poll bit: 0\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Final bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Multiplier: 20 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Length: 38\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;My Discr.: 3471785639\u0026nbsp; - Your Discr.: 2432996710\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min tx interval: 500 \u0026nbsp; - Min rx interval: 500\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min Echo interval: 500\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is not configured, there is no exposure to this issue. The below show command command will return empty output:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show running-config section bfd\nswitch\u0026gt;\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is configured but not operational, there is no exposure to this issue. The below show command will return empty output:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nswitch\u0026gt;\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is configured, and operational but not in authentication mode, there is no exposure to this issue and the output of below show command will look something like:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async On, Echo Off\nLast Up 06/04/26 14:15:32.259\nLast Down 06/04/26 14:14:50.328\nLast Diag: No Diagnostic\nAuthentication mode: None\nShared-secret profile: None\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 34, Rx Interval (ms) min/max/avg: 161/496/408 last: 163 ms ago\nTx Count: 29, Tx Interval (ms) min/max/avg: 375/499/440 last: 720 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 76, 2*TxInt: 0, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 13.65\nLast packet:\u0026nbsp; Version: 1 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Diagnostic: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;State bit: Up\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Demand bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Poll bit: 0\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Final bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Multiplier: 20 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Length: 24\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;My Discr.: 3471785639\u0026nbsp; - Your Discr.: 2432996710\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min tx interval: 500 \u0026nbsp; - Min rx interval: 500\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min Echo interval: 500\u003c/pre\u003e"
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"value": "In order to be vulnerable to CVE-2026-73458, the following condition must be met:\n\nBFD sessions configured with authentication are affected by this issue. All supported authentication modes are impacted. The full list of authentication modes is below:\n\n\u00a0\n\n * Password\n * Keyed MD5\n * Meticulous MD5\n * Keyed SHA1\n * Meticulous SHA1\n\n\n\n\nTo determine whether your sessions are affected, run the following show command. If the authentication mode is set to anything other than None, your configuration is impacted. In the example below, the authentication mode is set to Password, indicating an affected configuration.\n\n\n\nswitch\u003eshow bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async Off, Echo Off\nLast Up 06/04/26 13:55:50.630\nLast Down 06/04/26 13:55:49.725\nLast Diag: No Diagnostic\nAuthentication mode: Password\nShared-secret profile: bfdProfile_0\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 2308, Rx Interval (ms) min/max/avg: 81/538/438 last: 188 ms ago\nTx Count: 2206, Tx Interval (ms) min/max/avg: 380/516/458 last: 476 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 1762, 2*TxInt: 443, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 16:51.08\nLast packet:\u00a0 Version: 1 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Diagnostic: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State bit: Up\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Demand bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Poll bit: 0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Final bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Multiplier: 20 \u00a0 \u00a0 \u00a0 \u00a0 - Length: 38\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0My Discr.: 3471785639\u00a0 - Your Discr.: 2432996710\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min tx interval: 500 \u00a0 - Min rx interval: 500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min Echo interval: 500\n\n\n\u00a0\n\n\n\nIf BFD is not configured, there is no exposure to this issue. The below show command command will return empty output:\n\n\n\nswitch\u003eshow running-config section bfd\nswitch\u003e\n\n\n\u00a0\n\n\n\nIf BFD is configured but not operational, there is no exposure to this issue. The below show command will return empty output:\n\n\n\nswitch\u003eshow bfd peers detail\nswitch\u003e\n\n\n\u00a0\n\n\n\nIf BFD is configured, and operational but not in authentication mode, there is no exposure to this issue and the output of below show command will look something like:\n\n\n\nswitch\u003eshow bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async On, Echo Off\nLast Up 06/04/26 14:15:32.259\nLast Down 06/04/26 14:14:50.328\nLast Diag: No Diagnostic\nAuthentication mode: None\nShared-secret profile: None\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 34, Rx Interval (ms) min/max/avg: 161/496/408 last: 163 ms ago\nTx Count: 29, Tx Interval (ms) min/max/avg: 375/499/440 last: 720 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 76, 2*TxInt: 0, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 13.65\nLast packet:\u00a0 Version: 1 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Diagnostic: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State bit: Up\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Demand bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Poll bit: 0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Final bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Multiplier: 20 \u00a0 \u00a0 \u00a0 \u00a0 - Length: 24\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0My Discr.: 3471785639\u00a0 - Your Discr.: 2432996710\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min tx interval: 500 \u00a0 - Min rx interval: 500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min Echo interval: 500"
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"value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73458 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.8M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.9M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e"
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"discovery": "INTERNAL"
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"title": "On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou",
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"date": "2026-09-23",
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"percentile": "0.32277"
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"source": "psirt@arista.com"
}
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"descriptions": [
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"lang": "en",
"value": "On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s)."
}
],
"id": "CVE-2026-73458",
"lastModified": "2026-09-16T19:08:50.420",
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
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"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"modifiedSubIntegrityImpact": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H/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",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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"source": "psirt@arista.com",
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"published": "2026-09-15T20:17:43.160",
"references": [
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"source": "psirt@arista.com",
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24710-security-advisory-0154"
}
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"platforms": [
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"7010TX Series",
"7020R/R4 Series",
"7130 Series running EOS",
"7170 Series",
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"CloudVision eXchange",
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"product": "EOS",
"vendor": "Arista Networks",
"versions": [
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"status": "unaffected"
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"status": "affected",
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"status": "affected",
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"value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73458, the following condition must be met:\u003c/p\u003e\u003cdiv\u003eBFD sessions configured with authentication are affected by this issue. All supported authentication modes are impacted. The full list of authentication modes is below:\u003c/div\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cul\u003e\u003cli\u003ePassword\u003c/li\u003e\u003cli\u003eKeyed MD5\u003c/li\u003e\u003cli\u003eMeticulous MD5\u003c/li\u003e\u003cli\u003eKeyed SHA1\u003c/li\u003e\u003cli\u003eMeticulous SHA1\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eTo determine whether your sessions are affected, run the following show command. If the authentication mode is set to anything other than None, your configuration is impacted. In the example below, the authentication mode is set to Password, indicating an affected configuration.\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async Off, Echo Off\nLast Up 06/04/26 13:55:50.630\nLast Down 06/04/26 13:55:49.725\nLast Diag: No Diagnostic\nAuthentication mode: Password\nShared-secret profile: bfdProfile_0\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 2308, Rx Interval (ms) min/max/avg: 81/538/438 last: 188 ms ago\nTx Count: 2206, Tx Interval (ms) min/max/avg: 380/516/458 last: 476 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 1762, 2*TxInt: 443, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 16:51.08\nLast packet:\u0026nbsp; Version: 1 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Diagnostic: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;State bit: Up\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Demand bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Poll bit: 0\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Final bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Multiplier: 20 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Length: 38\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;My Discr.: 3471785639\u0026nbsp; - Your Discr.: 2432996710\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min tx interval: 500 \u0026nbsp; - Min rx interval: 500\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min Echo interval: 500\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is not configured, there is no exposure to this issue. The below show command command will return empty output:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show running-config section bfd\nswitch\u0026gt;\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is configured but not operational, there is no exposure to this issue. The below show command will return empty output:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nswitch\u0026gt;\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIf BFD is configured, and operational but not in authentication mode, there is no exposure to this issue and the output of below show command will look something like:\u003c/p\u003e\u003cpre\u003eswitch\u0026gt;show bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async On, Echo Off\nLast Up 06/04/26 14:15:32.259\nLast Down 06/04/26 14:14:50.328\nLast Diag: No Diagnostic\nAuthentication mode: None\nShared-secret profile: None\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 34, Rx Interval (ms) min/max/avg: 161/496/408 last: 163 ms ago\nTx Count: 29, Tx Interval (ms) min/max/avg: 375/499/440 last: 720 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 76, 2*TxInt: 0, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 13.65\nLast packet:\u0026nbsp; Version: 1 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Diagnostic: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;State bit: Up\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Demand bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Poll bit: 0\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Final bit: 0\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Multiplier: 20 \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; - Length: 24\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;My Discr.: 3471785639\u0026nbsp; - Your Discr.: 2432996710\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min tx interval: 500 \u0026nbsp; - Min rx interval: 500\n\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;Min Echo interval: 500\u003c/pre\u003e"
}
],
"value": "In order to be vulnerable to CVE-2026-73458, the following condition must be met:\n\nBFD sessions configured with authentication are affected by this issue. All supported authentication modes are impacted. The full list of authentication modes is below:\n\n\u00a0\n\n * Password\n * Keyed MD5\n * Meticulous MD5\n * Keyed SHA1\n * Meticulous SHA1\n\n\n\n\nTo determine whether your sessions are affected, run the following show command. If the authentication mode is set to anything other than None, your configuration is impacted. In the example below, the authentication mode is set to Password, indicating an affected configuration.\n\n\n\nswitch\u003eshow bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async Off, Echo Off\nLast Up 06/04/26 13:55:50.630\nLast Down 06/04/26 13:55:49.725\nLast Diag: No Diagnostic\nAuthentication mode: Password\nShared-secret profile: bfdProfile_0\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 2308, Rx Interval (ms) min/max/avg: 81/538/438 last: 188 ms ago\nTx Count: 2206, Tx Interval (ms) min/max/avg: 380/516/458 last: 476 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 1762, 2*TxInt: 443, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 16:51.08\nLast packet:\u00a0 Version: 1 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Diagnostic: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State bit: Up\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Demand bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Poll bit: 0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Final bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Multiplier: 20 \u00a0 \u00a0 \u00a0 \u00a0 - Length: 38\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0My Discr.: 3471785639\u00a0 - Your Discr.: 2432996710\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min tx interval: 500 \u00a0 - Min rx interval: 500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min Echo interval: 500\n\n\n\u00a0\n\n\n\nIf BFD is not configured, there is no exposure to this issue. The below show command command will return empty output:\n\n\n\nswitch\u003eshow running-config section bfd\nswitch\u003e\n\n\n\u00a0\n\n\n\nIf BFD is configured but not operational, there is no exposure to this issue. The below show command will return empty output:\n\n\n\nswitch\u003eshow bfd peers detail\nswitch\u003e\n\n\n\u00a0\n\n\n\nIf BFD is configured, and operational but not in authentication mode, there is no exposure to this issue and the output of below show command will look something like:\n\n\n\nswitch\u003eshow bfd peers detail\nVRF name: default\n-----------------\nPeer Addr 1.0.0.2, Intf Ethernet3/30/3, Type normal, Role active, State Up\nVRF default, LAddr 1.0.0.1, LD/RD 2432996710/3471785639\nSession state is Up and not using echo function\nHardware Acceleration: Async On, Echo Off\nLast Up 06/04/26 14:15:32.259\nLast Down 06/04/26 14:14:50.328\nLast Diag: No Diagnostic\nAuthentication mode: None\nShared-secret profile: None\nTxInt: 500 ms, RxInt: 500 ms, Multiplier: 20\nReceived RxInt: 500 ms, Received Multiplier: 20\nRx Count: 34, Rx Interval (ms) min/max/avg: 161/496/408 last: 163 ms ago\nTx Count: 29, Tx Interval (ms) min/max/avg: 375/499/440 last: 720 ms ago\nDetect Time: 10000 ms\nSched Delay: 1*TxInt: 76, 2*TxInt: 0, 3*TxInt: 0, GT 3*TxInt: 0\nRegistered protocols: bgp\nUptime: 13.65\nLast packet:\u00a0 Version: 1 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Diagnostic: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0State bit: Up\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Demand bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Poll bit: 0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 - Final bit: 0\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Multiplier: 20 \u00a0 \u00a0 \u00a0 \u00a0 - Length: 24\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0My Discr.: 3471785639\u00a0 - Your Discr.: 2432996710\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min tx interval: 500 \u00a0 - Min rx interval: 500\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Min Echo interval: 500"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered internally by Arista."
}
],
"datePublic": "2026-09-09T19:27:00.000Z",
"descriptions": [
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"value": "\u003cp\u003eOn affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).\u003c/p\u003e"
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"value": "On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s)."
}
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"impacts": [
{
"capecId": "CAPEC-115",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-115 Authentication Bypass"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 9.2,
"baseSeverity": "CRITICAL",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-303",
"description": "CWE-303 Incorrect Implementation of Authentication Algorithm",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T19:30:16.014Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24710-security-advisory-0154"
}
],
"solutions": [
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"lang": "en",
"supportingMedia": [
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"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73458 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.8M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.9M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e"
}
],
"value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2026-73458 has been fixed in the following releases:\n\n * 4.36.2F and later releases in the 4.36.x train\n * 4.35.6M and later releases in the 4.35.x train\n * 4.34.8M and later releases in the 4.34.x train\n * 4.33.9M and later releases in the 4.33.x train"
}
],
"source": {
"advisory": "154",
"defect": [
"1787150"
],
"discovery": "INTERNAL"
},
"title": "On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eNo mitigation is available for this issue.\u003c/p\u003e"
}
],
"value": "No mitigation is available for this issue."
}
],
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2026-73458",
"datePublished": "2026-09-15T19:30:16.014Z",
"dateReserved": "2026-08-12T16:45:03.510Z",
"dateUpdated": "2026-09-15T19:38:38.389Z",
"state": "PUBLISHED"
},
"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.
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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