CVE-2025-9247Public exploitNetwork attack vector

Service crash via unchecked vlan_set stack copy

Published Aug 20, 2025 · Updated Aug 21, 2025

Stack overflow in Linksys RE-series extender firmware allows remote authenticated users to crash web services via a crafted VLAN request. The setVlan handler in mod_form.so copies the unbounded vlan_set parameter into a stack local variable, overwriting the function return address. A valid management session is required, and the demonstrated consequence is persistent device-service loss rather than confirmed code execution.

CVSS severity8.8
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Linksys RE-series extender firmware allows remote authenticated users to crash web services via a crafted VLAN request. The setVlan handler in mod_form.so copies the unbounded vlan_set parameter into a stack local variable, overwriting the function return address. A valid management session is required, and the demonstrated consequence is persistent device-service loss rather than confirmed code execution.

The record

CVE
CVE-2025-9247
Published
Aug 20, 2025
Updated
Aug 21, 2025
Vendor
Linksys
Product
RE6250
Classifications
CWE-121, CWE-119, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.013.001
  2. Affected versionversion=1.0.04.001
  3. Affected versionversion=1.0.04.002
  4. Affected versionversion=1.1.05.003
  5. Affected versionversion=1.2.07.001

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linksys · RE6250version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001
Linksys · RE7000version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001
Linksys · RE9000version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001
Linksys · RE6300version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001
Linksys · RE6350version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001
Linksys · RE6500version=1.0.013.001; version=1.0.04.001; version=1.0.04.002; version=1.1.05.003; version=1.2.07.001

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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