CVE-2025-9527Public exploitNetwork attack vector

Authenticated code execution via unchecked ack_policy copy

Published Aug 27, 2025 · Updated Aug 27, 2025

Stack-based buffer overflow in Linksys E1700 1.0.0.4.003 allows remote authenticated users to crash the router via a crafted QoS request. The QoSSetup handler in mod_form.so copies the unbounded ack_policy parameter into a stack local, overwriting the saved return address. Access to the browser-based administration interface is required; exploitation can persistently interrupt service or redirect control flow.

CVSS severity8.8
High
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Linksys E1700 1.0.0.4.003 allows remote authenticated users to crash the router via a crafted QoS request. The QoSSetup handler in mod_form.so copies the unbounded ack_policy parameter into a stack local, overwriting the saved return address. Access to the browser-based administration interface is required; exploitation can persistently interrupt service or redirect control flow.

The record

CVE
CVE-2025-9527
Published
Aug 27, 2025
Updated
Aug 27, 2025
Vendor
Linksys
Product
E1700 N300 Wi-Fi Router
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.0.0.4.003

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linksys · E1700 N300 Wi-Fi Routerversion=1.0.0.4.003

Published CVSS scores

9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4VulDB CNACVSS: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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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