CVE-2025-8820: Linksys Re6250 Firmware buffer overflow (CVSS 8.8)

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Linksys Re6250 Firmware1.0.04.001

Linksys Re6300 Firmware1.2.07.001

Linksys Re6350 Firmware1.0.04.001

Linksys Re6500 Firmware1.0.013.001

Linksys Re7000 Firmware1.1.05.003

Linksys Re9000 Firmware1.0.04.002

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_54/54.mdExploitThird Party Advisory
https://github.com/wudipjq/my_vuln/blob/main/Linksys1/vuln_54/54.md#pocExploitThird Party Advisory
https://vuldb.com/?ctiid.319354Permissions RequiredVDB Entry
https://vuldb.com/?id.319354Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.626684Third Party AdvisoryVDB Entry
https://www.linksys.com/Product

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-8820 being actively exploited?

CVE-2025-8820 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.00%.

How severe is CVE-2025-8820?

CVE-2025-8820 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.00% probability of exploitation.

Which products are affected by CVE-2025-8820?

Affected products include Linksys Re6250 Firmware, Linksys Re6300 Firmware, Linksys Re6350 Firmware, Linksys Re6500 Firmware, Linksys Re7000 Firmware, and 1 more.

How do I fix CVE-2025-8820?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-8820 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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