CVE-2026-0834Public exploit

Administrative command execution via zero-length TDDP payload

Published Jan 21, 2026 · Updated Jan 21, 2026

Authentication bypass in TP-Link Archer C20 v5/v6, Archer AX53 v1, and TL-WR841N v13 allows remote attackers to run admin commands. In tddp_parserHandler(), a zero pktLength skips DES decryption, yet post-header bytes enter the decrypted-data buffer and execute as trusted subcommands. Access to UDP port 1040 on the local network is sufficient; factory reset erases configuration, and repeated reboot commands interrupt service.

CVSS severity7.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in TP-Link Archer C20 v5/v6, Archer AX53 v1, and TL-WR841N v13 allows remote attackers to run admin commands. In tddp_parserHandler(), a zero pktLength skips DES decryption, yet post-header bytes enter the decrypted-data buffer and execute as trusted subcommands. Access to UDP port 1040 on the local network is sufficient; factory reset erases configuration, and repeated reboot commands interrupt service.

The record

CVE
CVE-2026-0834
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-290, CAPEC-88, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2TP-Link CNACVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
5.3TP-Link security advisoryCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
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.

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 exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CAPEC-88OS Command Injection
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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