Stack-Based Buffer Overflow in Linksys E1700 Router
CVE-2025-9527

8.7HIGH

Key Information:

Vendor

Linksys
Status
E1700
Vendor
CVE Published:
27 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9527?

A stack-based buffer overflow vulnerability exists in the QoSSetup function of the Linksys E1700 router, specifically in the handling of the ack_policy argument. This flaw allows an attacker to exploit the system remotely, potentially leading to unauthorized access or system instability. Despite an early disclosure to the vendor, no responsive action has been taken. This vulnerability poses serious risks to network integrity and user confidentiality.

Affected Version(s)

E1700 1.0.0.4.003

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-9527 - Proof of Concept

References

https://vuldb.com/?id.321544
vdb-entrytechnical-description
https://vuldb.com/?ctiid.321544
signaturepermissions-required
https://vuldb.com/?submit.634826
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bond_yes (VulDB User)
.
CVE-2025-9527 : Stack-Based Buffer Overflow in Linksys E1700 Router