CVE-2026-73469Network attack vector

Unauthorized traffic forwarding via skipped uRPF drop

Published Sep 16, 2026 · Updated Sep 16, 2026

Incorrect authorization in Arista EOS 4.35.0F through 4.35.4M allows remote attackers to forward traffic that uRPF should drop. On affected 7050X4 and 7358X4 switches, loose-mode unicast reverse-path forwarding omits the intended verification drop for certain source routes. Exposure requires loose-mode IPv4 or IPv6 uRPF on an interface; the consequence is unauthorized packet forwarding, with no reported confidentiality or availability impact.

CVSS severity6.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Arista EOS 4.35.0F through 4.35.4M allows remote attackers to forward traffic that uRPF should drop. On affected 7050X4 and 7358X4 switches, loose-mode unicast reverse-path forwarding omits the intended verification drop for certain source routes. Exposure requires loose-mode IPv4 or IPv6 uRPF on an interface; the consequence is unauthorized packet forwarding, with no reported confidentiality or availability impact.

The record

CVE
CVE-2026-73469
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-863
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.35.0F <=4.35.4M

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.35.0F <=4.35.4M

Published CVSS scores

5.8Arista NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
6.9Arista NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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