CVE-2019-20082Public exploitNetwork attack vector

Service interruption via unchecked LAN DNS copy

Published Dec 28, 2021 · Updated Aug 5, 2024

Buffer overflow in ASUS RT-N53 firmware 3.0.0.4.376.3754 allows remote attackers to crash the router via crafted LAN DNS parameters. The update_lan_state function copies NVRAM-backed lan_dns1_x or lan_dns2_x values longer than its 100-byte local buffer without checking their length. No authentication is required, but the management endpoint must be reachable; the published proof of concept demonstrates a crash, not code execution.

CVSS severity9.8
Critical
EPSS probability2.04%
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 ASUS RT-N53 firmware 3.0.0.4.376.3754 allows remote attackers to crash the router via crafted LAN DNS parameters. The update_lan_state function copies NVRAM-backed lan_dns1_x or lan_dns2_x values longer than its 100-byte local buffer without checking their length. No authentication is required, but the management endpoint must be reachable; the published proof of concept demonstrates a crash, not code execution.

The record

CVE
CVE-2019-20082
Published
Dec 28, 2021
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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