CVE-2026-7473

Published Jun 5, 2026

Last updated 6 days ago

Exploit knownCVSS medium 6.9
Arista EOS
VXLAN
GRE

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-7473 describes a vulnerability affecting Arista EOS platforms that have a tunnel decapsulation configuration enabled. This includes configurations such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface. The core issue is that the affected switch will incorrectly decapsulate and forward unexpected tunneled packets if their destination IP matches the configured decapsulation IP. This vulnerability arises because the switch fails to verify the tunnel protocol type, which can lead to the processing of non-configured tunnel traffic. This issue has been reported as being actively exploited in the wild and is included in CISA's Known Exploited Vulnerabilities Catalog.

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.
Source
psirt@arista.com
NVD status
Analyzed
Products
eos

Risk scores

CVSS 4.0

Type
Secondary
Base score
6.9
Impact score
-
Exploitability score
-
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity
MEDIUM

CVSS 3.1

Type
Secondary
Base score
5.8
Impact score
1.4
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Severity
MEDIUM

Known exploits

Data from CISA

Vulnerability name
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Exploit added on
Jun 9, 2026
Exploit action due
Jun 23, 2026
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Weaknesses

psirt@arista.com
CWE-1023

Social media

Hype score
Not currently trending

  1. Top 3 Cybersecurity Threats 🫠CVE-2026-20245 — Cisco Catalyst SD-WAN Manager (Improper Encoding or Escaping of Output; authenticated local attacker can achieve root execution via crafted file). 🫠CVE-2026-7473 — Arista Extensible Operating System (incomplete tunneled-p

    @Dekryptoes

    12 Jun 2026

    62 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  2. Top 3 Cybersecurity Threats 1. CVE-2026-20245 — Cisco Catalyst SD-WAN Manager (improper output encoding; authenticated local attacker can achieve root execution via crafted file). 2. CVE-2026-7473 — Arista Extensible Operating System (incomplete tunneled-packet handling may l

    @Dekryptoes

    10 Jun 2026

    47 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  3. 米国サイバーセキュリティ・社会基盤安全保障庁(CISA)が既知の悪用された脆弱性カタログにアリスタネットワークス社EOSのCVE-2026-7473、ChromiumのCVE-2026-11645、Cisco Catalyst SD-WAN ManagerのCVE-2026-20245を追加。対処期限

    @__kokumoto

    9 Jun 2026

    1872 Impressions

    1 Retweet

    0 Likes

    0 Bookmarks

    1 Reply

    0 Quotes

  4. 🛡️ We added Arista EOS vulnerability CVE-2026-7473, Google Chromium V8 vulnerability CVE-2026-11645, & Cisco Catalyst vulnerability CVE-2026-20245 to our KEV Catalog. Visit https://t.co/myxOwap1Tf & apply mitigations to protect your org from cyberattacks. #Cybersecur

    @CISACyber

    9 Jun 2026

    3950 Impressions

    13 Retweets

    29 Likes

    2 Bookmarks

    1 Reply

    3 Quotes

Configurations

Related CVEs

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  3. A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.•CVE-2020-25684
  4. A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.•CVE-2020-25685
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References

Sources include official advisories and independent security research.