An issue was found in Arista EOS.
Priority LOW 35Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An issue was found in Arista EOS. Specific malformed ARP packets can impact the software forwarding of VxLAN packets. This issue is found in Arista’s EOS VxLAN code, which can allow attackers to crash the VxlanSwFwd agent. This affects EOS 4.21.8M and below releases in the 4.21.x train, 4.22.3M and below releases in the 4.22.x train, 4.23.1F and below releases in the 4.23.x train, and all releases in 4.15, 4.16, 4.17, 4.18, 4.19, 4.20 code train.
Why it matters now
EPSS 0.01044 64th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* | 4.21.0 – 4.21.8m; 4.22.0 – 4.22.3m; 4.23.0 – 4.23.1f | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.15:*:*:*:*:*:*:* | 4.15 | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.16:*:*:*:*:*:*:* | 4.16 | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.17:*:*:*:*:*:*:* | 4.17 | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.18:*:*:*:*:*:*:* | 4.18 | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.19:*:*:*:*:*:*:* | 4.19 | Vulnerable | Arista |
| cpe:2.3:o:arista:eos:4.20:*:*:*:*:*:*:* | 4.20 | Vulnerable | Arista |
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* Versions 4.21.0 – 4.21.8m; 4.22.0 – 4.22.3m; 4.23.0 – 4.23.1f Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.15:*:*:*:*:*:*:* Versions 4.15 Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.16:*:*:*:*:*:*:* Versions 4.16 Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.17:*:*:*:*:*:*:* Versions 4.17 Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.18:*:*:*:*:*:*:* Versions 4.18 Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.19:*:*:*:*:*:*:* Versions 4.19 Vulnerable ·Arista
- cpe:2.3:o:arista:eos:4.20:*:*:*:*:*:*:* Versions 4.20 Vulnerable ·Arista
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18948
- 2026-10-03 Alias added: GHSA-5vr9-8c6c-3m96
References
More Arista Eos vulnerabilities
- 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-2026-06569 Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass KEVCVSS 4.0MEDIUM 6.9
- TI-2017-10594 Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a… CVSS 3.1CRITICAL 9.8
- TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
- TI-2020-08209 utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2019-18948 · CVE Program
- CVE-2019-18948 · NVD
- FIRST EPSS
- GHSA-5vr9-8c6c-3m96 · GitHub Advisory Database · CC BY 4.0
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