CVE-2025-9527: A vulnerability was found in Linksys E1700 1.0.0.4.003

This month

HIGH 8.8MITIGATE

CVE-2025-9527 is a high-severity flaw (CVSS 8.8) affecting e1700 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Linksys E1700 1.0.0.4.003. This affects the function QoSSetup of the file /goform/QoSSetup. Performing manipulation of the argument ack_policy results in stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-119, CWE-121
Published	2025-08-27
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: linksys

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-27 14:15 UTCPublished CVE record published
2026-06-17 10:09 UTCUpdated Record last modified

linksys e1700 firmware MITIGATE

Affected: 1.0.0.4.003

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.4.003

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-9527?

e1700 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-9527 being exploited?

CVE-2025-9527 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-9527 affect?

CVE-2025-9527 affects e1700 firmware. Severity is high (CVSS 8.8). A vulnerability was found in Linksys E1700 1.0.0.4.003. This affects the function QoSSetup of the file /goform/QoSSetup. Performing manipulation of the argument ack_policy results in stack-based buffer overflow. The attack may be initiated

How urgent is CVE-2025-9527?

Priority 55/100. High severity; Public exploit reference

Related CVEs

CVE-2025-9528 MEDIUM 4.7 MITIGATE A vulnerability was determined in Linksys E1700 1.0.0.4.003
CVE-2025-9526 HIGH 8.8 MITIGATE A vulnerability has been found in Linksys E1700 1.0.0.4.003
CVE-2025-9525 HIGH 8.8 MITIGATE A flaw has been found in Linksys E1700 1.0.0.4.003
CVE-2024-22544 HIGH 8.0 MITIGATE An issue was discovered in Linksys Router E1700 version 1.0.04 (build 3), allows authenticated attackers to ex
CVE-2024-22543 MEDIUM 6.1 MITIGATE An issue was discovered in Linksys Router E1700 1.0.04 (build 3), allows authenticated attackers to escalate p

References

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