CVE-2021-46378Public exploitNetwork attack vector

Configuration disclosure via unauthenticated config.dat request

Published Mar 4, 2022 · Updated Aug 4, 2024

Incorrect access control in D-Link DIR-850L firmware 1.08TRb03 allows remote attackers to download the router configuration. The web interface serves /config.dat directly without requiring an authenticated session. A network-reachable HTTP interface is sufficient, and the demonstrated request exposes configuration data without altering the device.

CVSS severity7.5
High
EPSS probability31.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect access control in D-Link DIR-850L firmware 1.08TRb03 allows remote attackers to download the router configuration. The web interface serves /config.dat directly without requiring an authenticated session. A network-reachable HTTP interface is sufficient, and the demonstrated request exposes configuration data without altering the device.

The record

CVE
CVE-2021-46378
Published
Mar 4, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-425, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2022CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-425Direct Request ('Forced Browsing')
T1190Exploit Public-Facing Application

Public exploit references

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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