CVE-2026-5039— Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N
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I. Basic Information for CVE-2026-5039
Vulnerability Information
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Vulnerability Title
Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N
Source: NVD (National Vulnerability Database)
Vulnerability Description
TP-Link TL-WR841N v13 uses DES-CBC encryption in the TDDPv2 debug protocol with a cryptographic key derived from default web management credentials, making the key predictable if device is left in default configuration. A network-adjacent attacker can exploit this weakness to gain unauthorized access to the protocol, read debug data, modify certain device configuration values, and trigger device reboot, resulting in loss of integrity and a denial-of-service condition.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1394
Source: NVD (National Vulnerability Database)
Vulnerability Title
TP-Link TL-WR841N 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link TL-WR841N是中国普联（TP-Link）公司的一款路由器。 TP-Link TL-WR841N v13版本存在安全漏洞，该漏洞源于TDDPv2调试协议使用DES-CBC加密且密钥可预测，可能导致网络邻近攻击者未经授权访问协议、读取调试数据、修改设备配置并触发重启。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| TP-Link Systems Inc. | TL-WL841N v13 | 0 ~ 0.9.1 Build 20231120 Rel.62366 | - |
II. Public POCs for CVE-2026-5039
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|---|
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IV. Related Vulnerabilities
Same vendor: TP-Link Systems Inc.
- CVE-2026-5363
Use of weak cryptographic key in TP-Link Archer C7 - CVE-2026-30818
OS Command Injection Vulnerability in dnsmasq Module in TP-L - CVE-2026-30817
Arbitrary File Reading Vulnerability in dnsmasq Module in TP - CVE-2026-30816
Arbitrary File Reading Vulnerability in OpenVPN Module in TP - CVE-2026-30815
OS Command Injection Vulnerability in OpenVPN Module in TP-L
Same weakness: CWE-1394
V. Comments for CVE-2026-5039
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