CVE-2026-73443— On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indef
Quick assessment
Affected
Arista Networks EOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indefinit
Affected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Arista Networks | EOS | 4.36.0≤ 4.36.1F |
affected |
4.35.0≤ 4.35.5M |
affected | ||
4.34.0≤ 4.34.7M |
affected | ||
4.33.0≤ 4.33.9M |
affected |
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I. Basic Information for CVE-2026-73443
Vulnerability Information
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Vulnerability Title
On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indef
Source: CVE Program / CVE List V5
Vulnerability Description
On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indefinitely. Replayed advertisements can be used to advertise stale VRRP state, for example to prevent a backup router from taking over the virtual gateway after the original master has gone down, resulting in a denial of service for hosts using the virtual gateway address.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Arista Networks | EOS | 4.36.0 ~ 4.36.1F | - |
|
II. Public POCs for CVE-2026-73443
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-73443 (1)
Same Patch Batch · Arista Networks · 2026-09-16 · 28 CVEs total
| CVE-2026-73456 | 10.0 CRITICAL | Under certain circumstances, an unauthenticated gNPSI client can craft a malicious request |
| CVE-2026-73453 | 10.0 CRITICAL | Security Advisory 0174 |
| CVE-2026-86106 | 9.6 CRITICAL | Security Advisory 0179 |
| CVE-2026-73447 | 9.1 CRITICAL | Security Advisory 0162 - gNSI Certz/Bootz OS Command Injection via Crafted Rotate Request |
| CVE-2026-73464 | 8.8 HIGH | Security Advisory 0166 |
| CVE-2026-73435 | 8.2 HIGH | Security Advisory 0171 |
| CVE-2026-73454 | 8.1 HIGH | Security Advisory 0165 |
| CVE-2026-86108 | 8.0 HIGH | Security Advisory 0181 |
| CVE-2026-73461 | 8.0 HIGH | Security Advisory 0163 |
| CVE-2026-73455 | 7.5 HIGH | Security Advisory 0173 |
| CVE-2026-73439 | 7.5 HIGH | Security Advisory 0164 |
| CVE-2026-2380 | 7.4 HIGH | Security Advisory 0168 |
| CVE-2026-73450 | 6.9 MEDIUM | Security Advisory 0161 |
| CVE-2026-86109 | 6.6 MEDIUM | Security Advisory 0182 |
| CVE-2026-73462 | 6.5 MEDIUM | On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) sn |
| CVE-2026-77190 | 6.5 MEDIUM | Security Advisory 0177 |
| CVE-2026-73468 | 6.5 MEDIUM | Security Advisory 0175 |
| CVE-2026-73436 | 6.5 MEDIUM | Security Advisory 0171 |
| CVE-2026-86107 | 5.9 MEDIUM | Security Advisory 0180 |
| CVE-2026-73469 | 5.8 MEDIUM | Security Advisory 0176 |
Showing top 20 of 28 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: EOS
-
CVE-2026-73462
On affected platforms running Arista EOS with IGMP (Internet -
CVE-2026-73457
Under certain circumstances, the gNPSI client credentials mi -
CVE-2026-73456
Under certain circumstances, an unauthenticated gNPSI client -
CVE-2026-73442
On affected platforms running Arista EOS with VRRP enabled, -
CVE-2026-77190
Security Advisory 0177
Same vendor: Arista Networks
-
CVE-2026-73462
On affected platforms running Arista EOS with IGMP (Internet -
CVE-2026-73457
Under certain circumstances, the gNPSI client credentials mi -
CVE-2026-73456
Under certain circumstances, an unauthenticated gNPSI client -
CVE-2026-73442
On affected platforms running Arista EOS with VRRP enabled, -
CVE-2026-86107
Security Advisory 0180
Same weakness: CWE-294
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Http4s: DigestAuth allows replay of captured requests -
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GV-LPCLPC2011/2211 - ONVIF WS-Security PasswordDigest Replay -
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CVE-2026-84003
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CVE-2026-69676
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V. Comments for CVE-2026-73443
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