CVE-2021-40866 Auth bypass in n/a

What is CVE-2021-40866?

CVE-2021-40866 is a critical authentication bypass vulnerability in n/a, published on 13 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Certain NETGEAR smart switches are affected by a remote admin password change by an unauthenticated attacker via the (disabled by default) /sqfs/bin/sccd daemon, which fails to check authentication when the authentication TLV is missing from a received NSDP packet. This affects GC108P before 1.0.8.2, GC108PP before 1.0.8.2, GS108Tv3 before 7.0.7.2, GS110TPP before 7.0.7.2, GS110TPv3 before 7.0.7.2, GS110TUP before 1.0.5.3, GS308T before 1.0.3.2, GS310TP before 1.0.3.2, GS710TUP before 1.0.5.3, GS716TP before 1.0.4.2, GS716TPP before 1.0.4.2, GS724TPP before 2.0.6.3, GS724TPv2 before 2.0.6.3, GS728TPPv2 before 6.0.8.2, GS728TPv2 before 6.0.8.2, GS750E before 1.0.1.10, GS752TPP before 6.0.8.2, GS752TPv2 before 6.0.8.2, MS510TXM before 1.0.4.2, and MS510TXUP before 1.0.4.2.

Which versions are affected by CVE-2021-40866?

It affects 20 products.

Products include Netgear Gc108p Firmware, Netgear Gc108pp Firmware, Netgear Gs108t Firmware, Netgear Gs110tp Firmware, Netgear Gs110tpp Firmware, Netgear Gs110tup Firmware and 14 more.

How do I fix CVE-2021-40866?

No fix has been published for CVE-2021-40866 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-40866 being exploited?

There is no known exploitation of CVE-2021-40866 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2021-41314 Auth bypass in n/a High 8.8
• CVE-2021-33514 Command injection in n/a High 8.8
• CVE-2021-40867 Race condition in n/a High 7.8
• CVE-2021-45557 Command injection in n/a High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-89xh-mm48-p72f.