Arista EOS up to 4.36.1F Multicast Forwarding state issue

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k1.70-

Summaryinfo

A vulnerability categorized as critical has been discovered in Arista EOS up to 4.32.x/4.33.8M/4.34.7.1M/4.35.5M/4.36.1F. Affected is an unknown function of the component Multicast Forwarding. Such manipulation leads to state issue. This vulnerability is uniquely identified as CVE-2026-73468. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.32.x/4.33.8M/4.34.7.1M/4.35.5M/4.36.1F. It has been rated as critical. Affected by this issue is an unknown functionality of the component Multicast Forwarding. The manipulation with an unknown input leads to a state issue vulnerability. Using CWE to declare the problem leads to CWE-371. Impacted is availability. CVE summarizes:

A specially crafted packet can cause the premature expiry of multicast forwarding state on affected interfaces, potentially resulting in temporary multicast traffic loss during the affected period.

The advisory is available at arista.com. This vulnerability is handled as CVE-2026-73468 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 4.33.0F eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3287). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Arista EOS

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (Arista): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: EOS 4.33.0F

Timelineinfo

08/12/2026 CVE reserved
09/16/2026 +35 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/17/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: arista.com
Status: Confirmed

CVE: CVE-2026-73468 (🔒)
GCVE (CVE): GCVE-0-2026-73468
GCVE (VulDB): GCVE-100-405602
CERT Bund: WID-SEC-2026-3287 - Arista EOS: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2026 12:06
Updated: 09/17/2026 07:40
Changes: 09/16/2026 12:06 (75), 09/17/2026 07:40 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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