CVE-2026-5527Public exploitNetwork attack vector

HTTPS decryption via embedded private TLS key

Published Apr 4, 2026 · Updated Apr 4, 2026

Hard-coded key use in Tenda 4G03 Pro 1.0, 1.0re, 01.bin, and 04.03.01.53 allows remote attackers to decrypt HTTPS traffic. The firmware stores the same unencrypted ECDSA P-256 private TLS key in /etc/www/pem/server.key and distributes it in the public firmware image. Network access to the HTTPS service is sufficient for unauthenticated interception or device impersonation; no integrity or availability impact is reported.

CVSS severity5.3
Medium
EPSS probability0.43%
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

Hard-coded key use in Tenda 4G03 Pro 1.0, 1.0re, 01.bin, and 04.03.01.53 allows remote attackers to decrypt HTTPS traffic. The firmware stores the same unencrypted ECDSA P-256 private TLS key in /etc/www/pem/server.key and distributes it in the public firmware image. Network access to the HTTPS service is sufficient for unauthenticated interception or device impersonation; no integrity or availability impact is reported.

The record

CVE
CVE-2026-5527
Published
Apr 4, 2026
Updated
Apr 4, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
4G03 Pro
Classifications
CWE-320, CWE-321, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 2026Record 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=01.bin
  2. Affected versionversion=04.03.01.53
  3. Affected versionversion=1.0
  4. Affected versionversion=1.0re

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · 4G03 Proversion=01.bin; version=04.03.01.53; version=1.0; version=1.0re

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E: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 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-320Key Management Errors
CWE-321Use of Hard-coded Cryptographic Key
T1557Adversary-in-the-Middle

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