CVE-2025-2767Network attack vector

Root code execution via User-Agent script injection

Published Apr 23, 2025 · Updated Apr 23, 2025

Cross-site scripting in Arista NG Firewall 17.1.1 allows remote attackers to execute code as root through a crafted User-Agent header. The HTTP-header processing path fails to validate the User-Agent value before rendering it as executable script in reporting content. Exploitation requires an administrator to view the affected content; the injected script then reaches administrative functions and obtains root-context execution.

CVSS severity9.6
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Arista NG Firewall 17.1.1 allows remote attackers to execute code as root through a crafted User-Agent header. The HTTP-header processing path fails to validate the User-Agent value before rendering it as executable script in reporting content. Exploitation requires an administrator to view the affected content; the injected script then reaches administrative functions and obtains root-context execution.

The record

CVE
CVE-2025-2767
Published
Apr 23, 2025
Updated
Apr 23, 2025
Vendor
Arista Networks
Product
Arista NG Firewall
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista NG Firewallversion=17.1.1

Published CVSS scores

8.8Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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