CVE-2020-10884Public exploit

Adjacent-network message forgery via hard-coded cryptographic key

Published Mar 25, 2020 · Updated Aug 4, 2024

Use of a hard-coded key in TP-Link Archer A7 firmware 190726 allows network-adjacent attackers to forge encrypted tdpServer requests. The UDP port 20002 service uses a static AES-CBC key and IV for OneMesh message bodies, allowing attackers to construct accepted ciphertext. No authentication is required on the LAN, but root code execution requires a chain with separate command-injection and filesystem-permission flaws.

CVSS severity8.8
High
EPSS probability26.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of a hard-coded key in TP-Link Archer A7 firmware 190726 allows network-adjacent attackers to forge encrypted tdpServer requests. The UDP port 20002 service uses a static AES-CBC key and IV for OneMesh message bodies, allowing attackers to construct accepted ciphertext. No authentication is required on the LAN, but root code execution requires a chain with separate command-injection and filesystem-permission flaws.

The record

CVE
CVE-2020-10884
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
TP-Link
Product
Archer A7
Classifications
CWE-798, CWE-321, T1210
Attack vector
adjacent
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

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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 vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link · Archer A7version=Firmware Ver: 190726

Published CVSS scores

8.1Zero Day InitiativeCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
5.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:A/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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
CWE-321Use of Hard-coded Cryptographic Key
T1210Exploitation of Remote Services

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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