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TI-2026-53557 Aliases CVE-2026-76649GHSA-2cvh-668x-j624

Pre-Authentication NULL Pointer Dereference in UPnP SOAP Action Request Processing in TP-Link TL-WR841N

Priority LOW 24CWE-476Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

A NULL pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing SOAP action requests. A specially crafted SOAP action request containing unexpected XML content may cause the UPnP daemon to terminate unexpectedly. Successful exploitation may result in a denial-of-service condition affecting UPnP functionality until the service is restarted or the device is rebooted.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00268 19th percentileScored 2026-11-07
Fix Fixed TL-WR841N v14 (TP-Link System Inc.): TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478, TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-Link System Inc.TL-WR841N v14before TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478; before TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478, TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588Patch availableCNA
  • TL-WR841N v14 VendorTP-Link System Inc. Affected before TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478; before TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 Fixed in TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478, TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 Patch available CNA

Remediation

  • Fix · CNA TL-WR841N v14 (TP-Link System Inc.) Fixed in TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478, TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    TP-Link System TL-WR841N v14 — tp-link.com/us/support/faq/5270

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-53559 Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841NPriority LOW 24
    • TI-2026-53558 Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing in TP-Link TL-WR841NPriority LOW 24
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-76649
  2. 2026-10-03 Alias added: GHSA-2cvh-668x-j624

References

Patch 2

Advisory 1

  • TI-2026-65319 Authenticated OS Command Injection in TL-WR841N IPv6 WAN Configuration CVSS 4.0HIGH 8.5
  • TI-2026-56252 Unauthenticated Account Information Disclosure in Multiple Omada Controllers CVSS 4.0MEDIUM 6.9
  • TI-2026-74509 Missing authorization in TP-Link Omada Controller MSP mode CVSS 4.0HIGH 7.5
  • TI-2025-10706 UPnP DOS in TL-WR940N V6 CVSS 4.0HIGH 7.1
  • TI-2026-69751 Plaintext storage of device private key in Tapo S505 firmware CVSS 4.0MEDIUM 5.4
  • TI-2026-53559 Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N CVSS 4.0MEDIUM 5.3
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences