Is there a public exploit for CVE-2026-121288?

No public exploit for CVE-2026-121288 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121288?

CVE-2026-121288 scores CVSS 6.1 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.24%.

What does CVE-2026-121288 affect?

CVE-2026-121288 affects Arista Networks EOS.

6.1 Medium

An unauthenticated attacker on an adjacent network segment can bypass MD5 authentication and have unauthorized RIP route updates accepted…

CVE-2026-121288

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.

Assessment

CVSS: 6.1 (v4.0)
Severity: Medium
EPSS: 0.24% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 10 November 2026
Last updated: 13 November 2026
Affected: Arista Networks · EOS
Assigner: Arista

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

At the source

EUVD (ENISA)

References

https://www.arista.com/en/support/advisories-notices/security-advisory/25043-security-advisory-0221

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