CVE-2023-30280Network attack vector

Unauthenticated code execution via oversized getInputData parameter

Published Apr 26, 2023 · Updated Feb 3, 2025

Buffer overflow in NETGEAR router firmware allows remote attackers to execute arbitrary code through the fwSchedule.cgi page. The CGI handler copies attacker-controlled getInputData content without checking its size, overflowing a destination buffer. No authentication or user interaction is required on R6900 1.0.2.26, R6700v3 1.0.4.128, or R6700 1.0.0.26; exploitation can also crash the router.

CVSS severity9.8
Critical
EPSS probability1.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in NETGEAR router firmware allows remote attackers to execute arbitrary code through the fwSchedule.cgi page. The CGI handler copies attacker-controlled getInputData content without checking its size, overflowing a destination buffer. No authentication or user interaction is required on R6900 1.0.2.26, R6700v3 1.0.4.128, or R6700 1.0.0.26; exploitation can also crash the router.

The record

CVE
CVE-2023-30280
Published
Apr 26, 2023
Updated
Feb 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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