CVE-2025-68717: KAYSUS KS-WR3600 routers with firmware 1.0.5.9.1 allow authentication bypass during session validation

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CRITICAL 9.4REMOTEMITIGATE

CVE-2025-68717 is a critical-severity flaw (CVSS 9.4) affecting ks-wr3600 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

KAYSUS KS-WR3600 routers with firmware 1.0.5.9.1 allow authentication bypass during session validation. If any user is logged in, endpoints such as /cgi-bin/system-tool accept unauthenticated requests with empty or invalid session values. This design flaw lets attackers piggyback on another user's active session to retrieve sensitive configuration data or execute privileged actions without authentication.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.4 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-01-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kaysus

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

Am I affected?

Timeline

2026-01-08 21:15 UTCPublished CVE record published
2026-06-17 09:59 UTCUpdated Record last modified

kaysus ks-wr3600 firmware MITIGATE

Affected: 1.0.5.9.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.5.9.1

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · php-pecl-yac · FIXED · 3.0.2-1.fc46 · FEDORA-2026-0322a78385 · source

sudo dnf upgrade --advisory=FEDORA-2026-0322a78385

Fedora ELN · openldap · FIXED · 2.6.16-1.eln159 · FEDORA-2026-4b30c86326 · source

sudo dnf upgrade --advisory=FEDORA-2026-4b30c86326

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-2025-68717?

ks-wr3600 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-68717 being exploited?

CVE-2025-68717 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-2025-68717 affect?

CVE-2025-68717 affects ks-wr3600 firmware. Severity is critical (CVSS 9.4). KAYSUS KS-WR3600 routers with firmware 1.0.5.9.1 allow authentication bypass during session validation. If any user is logged in, endpoints such as /cgi-bin/system-tool accept unauthenticated requests with empty or invalid session values. T

How urgent is CVE-2025-68717?

Priority 55/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-68719 HIGH 8.8 MITIGATE KAYSUS KS-WR3600 routers with firmware 1.0.5.9.1 mishandle configuration management
CVE-2025-68716 HIGH 8.4 MITIGATE KAYSUS KS-WR3600 routers with firmware 1.0.5.9.1 enable the SSH service enabled by default on the LAN interfac

References

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