CVE-2025-8820 Linksys RE6250/RE6300/RE6350/RE6500/RE7000/RE9000 wirelessBasic stack-based overflow

High 8.7 Published 10 Aug 2025 Updated 12 Aug 2025

Remote attackers can trigger a stack-based buffer overflow in Linksys range extenders via the wirelessBasic form, potentially executing arbitrary code.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-8820?

CVE-2025-8820 is a high-severity memory corruption vulnerability in Linksys Re6250 Firmware, published on 10 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was determined in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. This vulnerability affects the function wirelessBasic of the file /goform/wirelessBasic. The manipulation of the argument submit_SSID1 leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2025-8820?

It affects 6 products.

Products include Linksys Re6250 Firmware, Linksys Re6300 Firmware, Linksys Re6350 Firmware, Linksys Re6500 Firmware, Linksys Re7000 Firmware, Linksys Re9000 Firmware.

How do I fix CVE-2025-8820?

No fix has been published for CVE-2025-8820 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-8820 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8820 exists.

All Linksys Re6250 Firmware vulnerabilities

Sources

Also known as GHSA-5fjr-h5fm-c33m.