CVE-2026-121291 | BDVDB-2026-404486 Detail

Arista NetworksEOS

Description#

A crafted Error Report can leave EOS stuck believing that a cache reset is in progress, preventing ROA publication, withdrawal reconciliation, and BGP origin-validation updates.

Impact#

CAPEC-21 Exploitation of Trusted Credentials

Weaknesses#

CWE-696 Incorrect Behavior Order

References#

https://www.arista.com/en/support/advisories-notices/security-advisory/25044-security-advisory-0222

Exploit#

No public exploit known

History#

Version 12026-11-10Record published in the CVE List.

Published

Published: 2026-11-10
Last modified: 2026-11-10

Vendor information

Vendor: Arista Networks
Product: EOS

All Arista Networks vulnerabilities

Score

8.2 High

EPSS

Not available

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
4.37.0F
Fixed
Not stated
Vulnerable
>= 4.36.0F and <= 4.36.2F
Fixed
Not stated
Vulnerable
>= 4.35.0F and <= 4.35.6M
Fixed
Not stated

Scoring System

CVSS v4.0

8.3 High

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	High
Vulnerable System Availability	Low
Subsequent System Confidentiality	None
Subsequent System Integrity	Low
Subsequent System Availability	None

CVSS v3.1

8.2 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	High
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).