CVE-2020-12773Network attack vector

Remote command execution via default credentials

Published Jun 8, 2020 · Updated Sep 17, 2024

Security misconfiguration in Realtek ADSL/PON Modem SoC firmware allows remote authenticated users to execute arbitrary commands via a built-in network monitoring tool. The SDK leaves a network-monitoring backdoor enabled with a default username and password, allowing supplied credentials to reach a terminal command interface. Access requires the default credentials and network reachability; successful execution can expose or alter device data and services, while no firmware version boundary is published.

CVSS severity9.6
Critical
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security misconfiguration in Realtek ADSL/PON Modem SoC firmware allows remote authenticated users to execute arbitrary commands via a built-in network monitoring tool. The SDK leaves a network-monitoring backdoor enabled with a default username and password, allowing supplied credentials to reach a terminal command interface. Access requires the default credentials and network reachability; successful execution can expose or alter device data and services, while no firmware version boundary is published.

The record

CVE
CVE-2020-12773
Published
Jun 8, 2020
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.6TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059Command and Scripting Interpreter

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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