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CVE-2026-8619: Unauthenticated Denial-of-Service Vulnerability in HTTP Service in TP-Link TL-MR100, TL-MR150, TL-MR6400 and Archer MR600

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-20 · updated 2026-10-27
• Weakness: CWE-476

Description

An unauthenticated denial-of-service vulnerability was identified in TP-Link TL-MR100 v3.2, TL-MR150 v3.2, TL-MR6400 v8.0 and Archer MR600 v2, due to improper handling of exceptional request conditions that may lead to a NULL pointer dereference.  A remote attacker on an adjacent network can send a specially crated HTTP request to trigger a crash of the HTTP service process. Successful exploitation may cause the HTTP service to crash, making the web management interface and HTTP-dependent functionality temporarily unavailable.

Affected products

• TP-Link Systems Inc. Archer MR600 v5.0: before 1.10.0 — fixed in 1.10.0
• TP-Link Tl-Mr100 Firmware: before 1.3.0 — fixed in 1.3.0
• TP-Link Tl-Mr150 Firmware: before 1.3.0 — fixed in 1.3.0
• TP-Link Systems Inc. TL-MR6400 v5.3: before 1.5.0 — fixed in 1.5.0

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. Archer MR600 v5.0 1.10.0; TP-Link Tl-Mr100 Firmware 1.3.0; TP-Link Tl-Mr150 Firmware 1.3.0; TP-Link Systems Inc. TL-MR6400 v5.3 1.5.0. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/en/support/download/archer-mr600/v2/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr100/v3.20/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr150/v3.20/#Firmware
• https://www.tp-link.com/en/support/download/tl-mr6400/v8/#Firmware
• https://www.tp-link.com/us/support/faq/5253/

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