CVE-2020-10881Public exploitNetwork attack vector

Root code execution via DNS response overflow

Published Mar 25, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in TP-Link Archer A7 Firmware Ver: 190726 allows remote attackers to execute code as root via DNS responses. The DNS response handler allows crafted message data to exceed a fixed-length stack buffer, corrupting adjacent stack memory. No authentication or user interaction is required, and successful exploitation grants arbitrary code execution as root.

CVSS severity9.8
Critical
EPSS probability10.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in TP-Link Archer A7 Firmware Ver: 190726 allows remote attackers to execute code as root via DNS responses. The DNS response handler allows crafted message data to exceed a fixed-length stack buffer, corrupting adjacent stack memory. No authentication or user interaction is required, and successful exploitation grants arbitrary code execution as root.

The record

CVE
CVE-2020-10881
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
TP-Link
Product
Archer A7
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2020CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Firmware Ver: 190726

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TP-Link · Archer A7version=Firmware Ver: 190726

Published CVSS scores

10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Zero Day InitiativeCVSS:3.0/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 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-121Stack-based 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo