CVE-2026-121367

Security Advisory 0220

Published Nov 10, 2026 CVSS 4.0 · 6.1 Medium EPSS < 1% KEV · Not listed

Description

On affected Arista EOS platforms with Routing Information Protocol version 2 (RIPv2) configured, under certain conditions, RIPv2 might be silently enabled on management interfaces even when the RIP agent intends to disable it. It allows an unauthenticated attacker with access to the adjacent network to send crafted RIPv2 route advertisements to the device's management IP address. The device could accept and install those routes without authentication.

Successful exploitation could allow the attacker to redirect traffic flows to an attacker-controlled destination, install more-specific routes that blackhole legitimate traffic, or otherwise disrupt network reachability for systems whose traffic passes through the affected device.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Arista Networks

EOS

unaffected

Version	Status	Constraints
`1.0.0`	affected	< 4.33.0F
`4.33.0F`	affected	≤ 4.33.10M
`4.34.0F`	affected	≤ 4.34.8M
`4.35.0F`	affected	≤ 4.35.6M
`4.36.0F`	affected	≤ 4.36.2F
`4.37.0F`	affected	—

No data.

Vendor Product Versions

Arista

Eos

Version	Status	Scheme	Platform
`[1.0.0,4.33.0F)`	affected	generic	['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']
`[4.33.0F,4.33.10M]`	affected	generic	['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']
`[4.34.0F,4.34.8M]`	affected	generic	['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']
`[4.35.0F,4.35.6M]`	affected	generic	['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']
`[4.36.0F,4.36.2F]`	affected	generic	['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']
`4.37.0F`	affected	generic	['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']

Remediation

Vendor Workaround

switch# configure terminal switch(config)# router rip switch(config-router-rip)# shutdown switch(config-router-rip)# end (Workaround: In environments where RIP is not required, disable it within each affected VRF instance. If RIP is necessary on data interfaces but not the management subnet, verify no RIP network prefix matches the management subnet.)

Tracking

Advisories

No advisories available

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.292% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://www.arista.com/en/support/advisories-notices/security-advisory/25042-security-advisory-0220

History

Nov 12, 2026 4:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Arista Arista eos
Vendors & Products		Arista Arista eos

Nov 10, 2026 8:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		On affected Arista EOS platforms with Routing Information Protocol version 2 (RIPv2) configured, under certain conditions, RIPv2 might be silently enabled on management interfaces even when the RIP agent intends to disable it. It allows an unauthenticated attacker with access to the adjacent network to send crafted RIPv2 route advertisements to the device's management IP address. The device could accept and install those routes without authentication. Successful exploitation could allow the attacker to redirect traffic flows to an attacker-controlled destination, install more-specific routes that blackhole legitimate traffic, or otherwise disrupt network reachability for systems whose traffic passes through the affected device.
Title		Security Advisory 0220
Weaknesses		CWE-440
References		https://www.arista.com/en/support/advisories-notices/security-advisory/25042-security-advisory-0220
Metrics		cvssV3_1 `{'score': 9.6, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H'}` cvssV4_0 `{'score': 6.1, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:L/SA:L'}`