CVE-2026-121368 (GCVE-0-2026-121368)
Vulnerability from cvelistv5 – Published: 2026-11-10 20:10 – Updated: 2026-11-10 20:10
VLAI
EPSS
VEX
Title
Security Advisory 0206
Summary
On affected platforms running Arista EOS with Bidirectional Forwarding Detection (BFD) configured to use keyed MD5 or keyed SHA1 authentication, an unauthenticated attacker with network adjacency (direct or multi-hop) to a BFD-enabled interface can send a specially crafted BFD packet resulting in a system reboot.
Severity
CWE
- CWE-787 - Out-of-bounds Write
Assigner
Arista
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.arista.com/en/support/advisories-noti… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.36.0F , ≤ 4.36.2F
(custom)
Affected: 4.35.0F , ≤ 4.35.6M (custom) Affected: 4.34.0F , ≤ 4.34.8M (custom) Affected: 4.33.0F , ≤ 4.33.10M (custom) Affected: 4.32.0F , < 4.33.0F (custom) Affected: 1.0.0 , < 4.32.0F (custom) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"platforms": [
"710 Series",
"720D Series",
"720XP/722XPM Series",
"750X Series",
"7010TX Series",
"7020R/R4 Series",
"7130 Series running EOS",
"7170 Series",
"7050X3/X4 Series",
"7060X/X2/X4/X5/X6/XE7 Series",
"7260X/X3 Series",
"7280R/R2/R3/R4 Series",
"7300X/X3 Series",
"7320X Series",
"7358X4 Series",
"7368X4 Series",
"7388X5 Series",
"7500R/R2/R3 Series",
"7800R3/R4 Series",
"7700R4 Series",
"AWE 5000 Series",
"AWE 7200R Series",
"ZTX-7200 Series",
"CloudEOS",
"cEOS-lab",
"vEOS-lab",
"CloudVision eXchange, virtual or physical appliance"
],
"product": "EOS",
"vendor": "Arista Networks",
"versions": [
{
"lessThanOrEqual": "4.36.2F",
"status": "affected",
"version": "4.36.0F",
"versionType": "custom"
},
{
"lessThanOrEqual": "4.35.6M",
"status": "affected",
"version": "4.35.0F",
"versionType": "custom"
},
{
"lessThanOrEqual": "4.34.8M",
"status": "affected",
"version": "4.34.0F",
"versionType": "custom"
},
{
"lessThanOrEqual": "4.33.10M",
"status": "affected",
"version": "4.33.0F",
"versionType": "custom"
},
{
"lessThan": "4.33.0F",
"status": "affected",
"version": "4.32.0F",
"versionType": "custom"
},
{
"lessThan": "4.32.0F",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cpre\u003eswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode md5 shared-secret profile profile1\n\n(or meticulous mode, or sha1 variants)\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode md5 shared-secret profile profile1 meticulous\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode sha1 shared-secret profile profile1\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode sha1 shared-secret profile profile1 meticulous\n\n(Per-interface config may also apply:)\nswitch(s1)#show running-config section bfd\ninterface Ethernet1\n bfd authentication mode md5 shared-secret profile profile1\u003c/pre\u003e"
}
],
"value": "switch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode md5 shared-secret profile profile1\n\n(or meticulous mode, or sha1 variants)\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode md5 shared-secret profile profile1 meticulous\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode sha1 shared-secret profile profile1\n\nswitch(s1)#show running-config section router bfd\nrouter bfd\n authentication mode sha1 shared-secret profile profile1 meticulous\n\n(Per-interface config may also apply:)\nswitch(s1)#show running-config section bfd\ninterface Ethernet1\n bfd authentication mode md5 shared-secret profile profile1"
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "This issue was discovered externally by Joshua Foote from the XOR team at JP Morgan Chase \u0026 Co."
}
],
"descriptions": [
{
"lang": "en",
"value": "On affected platforms running Arista EOS with Bidirectional Forwarding Detection (BFD) configured to use keyed MD5 or keyed SHA1 authentication, an unauthenticated attacker with network adjacency (direct or multi-hop) to a BFD-enabled interface can send a specially crafted BFD packet resulting in a system reboot."
}
],
"impacts": [
{
"capecId": "CAPEC-100",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-100 Overflow Buffers"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.6,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"cvssV4_0": {
"baseScore": 8.9,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"version": "4.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-10T20:10:00.505Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25028-security-advisory-0206"
}
],
"source": {
"advisory": "Security Advisory 0206",
"defects": [
"1965007"
],
"discovery": "EXTERNAL"
},
"title": "Security Advisory 0206"
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2026-121368",
"datePublished": "2026-11-10T20:10:00.505Z",
"dateReserved": "2026-11-03T11:27:14.150Z",
"dateUpdated": "2026-11-10T20:10:00.505Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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