CVE-2026-121288
Security Advisory 0221
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
An unauthenticated attacker on an adjacent network segment can bypass MD5 authentication and have unauthorized RIP route updates accepted by the device. Successful exploitation requires that RIPv2 MD5 authentication is configured on the affected interface. An attacker who can inject crafted RIPv2 packets could cause the device to install routes that redirect network traffic through attacker-controlled paths, create routing loops, or blackhole traffic, disrupting network connectivity.
| CWE | CWE-303 |
| Vendor | arista networks |
| Product | eos |
| Published | Nov 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Arista Networks / EOS
4.37.0F 4.36.0F ≤ 4.36.2F 4.35.0F ≤ 4.35.6M 4.34.0F ≤ 4.34.8M 4.33.0F ≤ 4.33.10M 4.32.0F < 4.33.0F 1.0.0 < 4.32.0F
References
Credits
🔍 Arista would like to acknowledge and thank Joshua Foote from the XOR team at JP Morgan Chase for responsibly reporting CVE-2026-121288.