CVE-2021-38517

Data alteration and service interruption via memory corruption

Published Aug 11, 2021 · Updated Aug 4, 2024

Memory corruption in NETGEAR R6400, RAX75, RAX80, and XR300 firmware allows attackers to alter data or interrupt router service. Public advisories identify out-of-bounds reads and writes but do not disclose the affected component, the untrusted input, or the operation that crosses a buffer boundary. Exploitation requires adjacent-network access and high privileges, with no published confidentiality impact.

CVSS severity6.9
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in NETGEAR R6400, RAX75, RAX80, and XR300 firmware allows attackers to alter data or interrupt router service. Public advisories identify out-of-bounds reads and writes but do not disclose the affected component, the untrusted input, or the operation that crosses a buffer boundary. Exploitation requires adjacent-network access and high privileges, with no published confidentiality impact.

The record

CVE
CVE-2021-38517
Published
Aug 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, CWE-787
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Aug 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 vectoradjacent
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
6.9NETGEARCVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write

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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