Report · SecurityWeekAbout CVE-2026-7473Published 10 Jun 2026

No Patch Planned for Exploited Arista EOS Vulnerability

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Authoritative record:CVE-2026-7473· Medium 5.8

Exploited in the wild · KEV due 23 Jun 2026 : apply the vendor's fix or mitigations to EOS now.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.8Medium

How severe the flaw is on the 0–10 CVSS scale.

KEV deadline: 23 Jun 2026 US federal agencies must patch by this date; a sensible deadline for everyone else. Other KEV due dates

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Changed
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 5 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 4 days after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by Arista Networks, Inc.
29 Apr 202620:08 UTC, 37 days before disclosure
CVE published
on cve.org
5 Jun 202616:22 UTC, t = 0
In Threat Radar
record ingested
5 Jun 202616:48 UTC, 26 minutes after disclosure
Added to CISA KEV (opens in a new tab)
exploitation confirmed
9 Jun 2026, 4 days after disclosure
KEV remediation due
US federal deadline
23 Jun 2026, 18 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Arista NetworksEOS	Affected >=4.35.0 <=4.35 >=4.34.0 <=4.34 >=4.33.0 <=4.33 >=4.32.0 <=4.32 >=4.31.0 <=4.31 <=4.30 =4.36.0	Fixed in–

AI-suggested

Organizations must follow Arista's detailed mitigation instructions as provided in the vendor advisory. If mitigation is not feasible, discontinuing use of the vulnerable devices is recommended. Federal agencies are urged by CISA to address this vulnerability within two weeks. Check the vendor advisory for the exact mitigation steps and apply them promptly.

Description

A vulnerability (CVE-2026-7473) in Arista EOS allows certain tunnel endpoint configurations to incorrectly process non-configured tunnel traffic. This flaw affects multiple Arista switch series and is actively exploited in the wild. Arista has stated no patch or software upgrade will be provided due to risks of breaking existing configurations. Instead, organizations are advised to apply vendor-supplied mitigations or discontinue use of vulnerable devices. The US CISA has added this vulnerability to its Known Exploited Vulnerabilities list, urging remediation within two weeks.

Impact

The vulnerability allows an attacker to send tunnel traffic of unconfigured types to a device configured as a tunnel endpoint, potentially leading to unauthorized processing of such traffic. This could affect network traffic handling and security on affected Arista EOS devices. The flaw is actively exploited in the wild, increasing risk to organizations using vulnerable devices.

Summary

CVE-2026-7473 is a vulnerability in Arista Extensible Operating System (EOS) where the tunnel protocol type is not properly verified in certain configurations. Devices configured as tunnel endpoints with decapsulation IPs (e.g., decap-groups, GRE tunnel interfaces, VXLAN) may incorrectly accept and decapsulate tunnel protocols not explicitly configured. This affects Arista 7020R, 7280R/R2, 7500R/R2 series, and certain IPv6 decap group scenarios on 7280R3, 7500R3, and 7800R3 series. The vulnerability has a CVSS score of 6.9 and is exploited in the wild. CISA has added this to its KEV list with a two-week remediation directive for federal agencies.

References

securityweek.com/no-patch-planned-for-exploited-arista-eos-vulnerability/ (opens in a new tab)

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Jun 2026, 06:40 UTC

Public exploits and detectionGitHub proofs of concept

References

Community reviews