CVE-2026-18330

Administrator password disclosure via shared RSA private key

Published Sep 3, 2026 · Updated Sep 4, 2026

Hard-coded cryptographic keys in the TP-Link Archer AX55 v4 web module allow attackers to disclose administrator passwords over the LAN. The module uses a shared RSA-1024 private key to decrypt captured HTTP login traffic, while a weakened AES session key further reduces session confidentiality. Exploitation requires LAN access and capture of an administrator login session; the bounded consequence is disclosure of the transmitted administrator password.

CVSS severity6.1
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded cryptographic keys in the TP-Link Archer AX55 v4 web module allow attackers to disclose administrator passwords over the LAN. The module uses a shared RSA-1024 private key to decrypt captured HTTP login traffic, while a weakened AES session key further reduces session confidentiality. Exploitation requires LAN access and capture of an administrator login session; the bounded consequence is disclosure of the transmitted administrator password.

The record

CVE
CVE-2026-18330
Published
Sep 3, 2026
Updated
Sep 4, 2026
Vendor
TP-Link Systems Inc.
Product
Archer AX55
Classifications
CWE-321, CAPEC-117, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record 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=0 <1.2.1 Build 20260527

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · Archer AX55version=0 <1.2.1 Build 20260527

Published CVSS scores

6.1TP-Link Systems Inc.CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA: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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-321Use of hard-coded cryptographic key
CAPEC-117Interception
T1040Network Sniffing

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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