Vulnerability-Lookup

FKIE_CVE-2026-5039

Vulnerability from fkie_nvd - Published: 2026-04-23 18:16 - Updated: 2026-10-25 23:10

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

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.

References

	URL	Tags
	f23511db-6c3e-4e32-a477-6aa17d310630	https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware	Product

Impacted products

	Vendor	Product	Version
	tp-link	tl-wr841n_firmware	*
	tp-link	tl-wr841n	13.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "TL-WL841N v13",
          "vendor": "TP-Link Systems Inc.",
          "versions": [
            {
              "lessThan": "0.9.1 Build 20231120 Rel.62366",
              "status": "affected",
              "version": "0",
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        }
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    }
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  "configurations": [
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              "matchCriteriaId": "DCEA238F-6C56-45C3-B889-477568C5BE47",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "El TP-Link TL-WR841N v13 utiliza cifrado DES-CBC en el protocolo de depuraci\u00f3n TDDPv2 con una clave criptogr\u00e1fica derivada de las credenciales predeterminadas de gesti\u00f3n web, lo que hace que la clave sea predecible si el dispositivo se deja en la configuraci\u00f3n predeterminada. Un atacante adyacente a la red puede explotar esta debilidad para obtener acceso no autorizado al protocolo, leer datos de depuraci\u00f3n, modificar ciertos valores de configuraci\u00f3n del dispositivo y activar el reinicio del dispositivo, lo que resulta en una p\u00e9rdida de integridad y una condici\u00f3n de denegaci\u00f3n de servicio."
    }
  ],
  "id": "CVE-2026-5039",
  "lastModified": "2026-10-25T23:10:00.167",
  "metrics": {
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          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
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          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "type": "Secondary"
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    "ssvcV203": [
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          "role": "CISA Coordinator",
          "timestamp": "2026-04-23T17:38:11.142339Z",
          "version": "2.0.3"
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  "published": "2026-04-23T18:16:30.377",
  "references": [
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      "tags": [
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      ],
      "url": "https://www.tp-link.com/us/support/download/tl-wr841n/v13/#Firmware"
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  ],
  "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary"
    }
  ]
}

CVE-2026-5039 (GCVE-0-2026-5039)

Vulnerability from cvelistv5 – Published: 2026-04-23 16:10 – Updated: 2026-04-28 17:45

Title

Predictable Default Cryptographic Key Used for DES Encryption in TP-Link TL-WL841N

Summary

Severity

6.1 (Medium)


                        
                          CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-23 17:38 UTC

CWE

CWE-1394 - Use of default cryptographic key

Assigner

TPLink CNA under the mitre root

CNA scorecard B 87/100 over 109 records in the last 180 days details

References

1 reference

URL	Tags
https://www.tp-link.com/us/support/download/tl-wr…	patch

Impacted products

1 product

Vendor	Product	Version
TP-Link Systems Inc.	TL-WL841N v13	Affected: 0 , < 0.9.1 Build 20231120 Rel.62366 (custom)

Credits

Ben Grinberg, Adiel Sol, Daniel Lubel, Erez Cohen, Nir Somech, Arad Inbar, Dream Group

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-5039",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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