CVE-2026-7473
CVE-2026-7473 is a medium-severity vulnerability in Arista Eos with a CVSS 3.x base score of 5.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-09). The underlying weakness is classified as CWE-1023.
Key facts
- Severity: Medium (CVSS 3.x base score 5.8)
- CVSS v4: 6.9
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2026-06-09)
- EU (EUVD) id: EUVD-2026-34858
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-06-09)
- Weakness: CWE-1023
- Affected product: Arista Eos
- Published:
- Last modified:
Description
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
Frequently asked questions
- What is CVE-2026-7473?
- On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
- How severe is CVE-2026-7473?
- CVE-2026-7473 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-7473 being actively exploited?
- Yes. CVE-2026-7473 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-09, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2026-7473?
- CVE-2026-7473 affects Arista Eos. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-7473?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2026-7473 have an EU (EUVD) identifier?
- Yes. CVE-2026-7473 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34858. It is also flagged as exploited in the EUVD (since 2026-06-09).
- When was CVE-2026-7473 published?
- CVE-2026-7473 was published on 2026-06-05 and last updated on 2026-06-17.
References
- https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
- https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473
Affected products (1)
- cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
More vulnerabilities in Arista Eos
- CVE-2015-8236 — Critical (CVSS 10.0): Arista EOS before 4.11.12, 4.12 before 4.12.11, 4.13 before 4.13.14M, 4.14 before 4.14.5FX.5, and 4.15 before…
- CVE-2020-10188 — Critical (CVSS 9.8): utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes…
- CVE-2017-18017 — Critical (CVSS 9.8): The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before…
- CVE-2017-14491 — Critical (CVSS 9.8): Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or…
- CVE-2014-7169 — Critical (CVSS 9.8): GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values…
- CVE-2014-6271 — Critical (CVSS 9.8): GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables,…
All CVEs affecting Arista Eos →
Other CWE-1023 vulnerabilities
- CVE-2026-4599 — Critical (CVSS 9.1): Versions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing…
- CVE-2025-62000 — High (CVSS 7.1): BullWall Ransomware Containment may not always detect an encrypted file. This issue affects a specific file inspection…
- CVE-2026-53839 — Medium (CVSS 6.5): OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching…
- CVE-2025-55333 — Medium (CVSS 6.1): Incomplete comparison with missing factors in Windows BitLocker allows an unauthorized attacker to bypass a security…
- CVE-2025-46722 — Medium (CVSS 4.2): vLLM is an inference and serving engine for large language models (LLMs). In versions starting from 0.7.0 to before…
- CVE-2026-48587 — Low (CVSS 3.1): An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.utils.cache.has_vary_header()` in…