Authentication bypass by spoofing in Arista EOS
Priority LOW 33CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-290.
Summary
On affected platforms running Arista EOS, maliciously formed UDP packets with source port 3503 may be accepted by EOS. UDP Port 3503 is associated with LspPing Echo Reply. This can result in unexpected behaviors, especially for UDP based services that do not perform some form of authentication.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00418 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Arista | EOS | 4.33.0 – 4.33.1F; 4.33.1.0 – 4.33.1.2F; 4.32.4.0 – 4.32.4.1M; 4.31.0 – 4.31.6M; 4.30.0 – 4.30.9.1M | — | No fix listed | CNA |
- EOS VendorArista Affected 4.33.0 – 4.33.1F; 4.33.1.0 – 4.33.1.2F; 4.32.4.0 – 4.32.4.1M; 4.31.0 – 4.31.6M; 4.30.0 – 4.30.9.1M Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-6188
- 2026-10-03 Alias added: GHSA-hjjq-j76f-mvq4
References
More Arista vulnerabilities
- TI-2026-79524 Privilege escalation in Arista VeloCloud Orchestrator on-premises KEVCVSS 4.0CRITICAL 9.4
- TI-2026-63212 Improper input validation in Arista VeloCloud Orchestrator On-Prem KEVCVSS 4.0CRITICAL 9.5
- TI-2026-13992 VeloCloud Orchestrator OS Command Injection KEVCVSS 4.0CRITICAL 10.0
- TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
- TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2025-6188 · CVE Program
- CVE-2025-6188 · NVD
- FIRST EPSS
- GHSA-hjjq-j76f-mvq4 · GitHub Advisory Database · CC BY 4.0
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