What’s Vulnerable › Vulnerabilities
CVE-2021-40866
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.8% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-09-13 · updated 2026-06-17
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.
Affected products
- NETGEAR Gc108P Firmware: before 1.0.8.2 — fixed in 1.0.8.2
- NETGEAR Gc108Pp Firmware: before 1.0.8.2 — fixed in 1.0.8.2
- NETGEAR Gs108T Firmware: before 7.0.7.2 — fixed in 7.0.7.2
- NETGEAR Gs110Tp Firmware: before 7.0.7.2 — fixed in 7.0.7.2
- NETGEAR Gs110Tpp Firmware: before 7.0.7.2 — fixed in 7.0.7.2
- NETGEAR Gs110Tup Firmware: before 1.0.5.3 — fixed in 1.0.5.3
- NETGEAR Gs308T Firmware: before 1.0.3.2 — fixed in 1.0.3.2
- NETGEAR Gs310Tp Firmware: before 1.0.3.2 — fixed in 1.0.3.2
- NETGEAR Gs710Tup Firmware: before 1.0.5.3 — fixed in 1.0.5.3
- NETGEAR Gs716Tp Firmware: before 1.0.4.2 — fixed in 1.0.4.2
- NETGEAR Gs716Tpp Firmware: before 1.0.4.2 — fixed in 1.0.4.2
- NETGEAR Gs724Tp Firmware: before 2.0.6.3 — fixed in 2.0.6.3
- NETGEAR Gs724Tpp Firmware: before 2.0.6.3 — fixed in 2.0.6.3
- NETGEAR Gs728Tp Firmware: before 6.0.8.2 — fixed in 6.0.8.2
- NETGEAR Gs728Tpp Firmware: before 6.0.8.2 — fixed in 6.0.8.2
- NETGEAR Gs750E Firmware: before 1.0.1.10 — fixed in 1.0.1.10
- NETGEAR Gs752Tp Firmware: before 6.0.8.2 — fixed in 6.0.8.2
- NETGEAR Gs752Tpp Firmware: before 6.0.8.2 — fixed in 6.0.8.2
- NETGEAR Ms510Txm Firmware: before 1.0.4.2 — fixed in 1.0.4.2
- NETGEAR Ms510Txup Firmware: before 1.0.4.2 — fixed in 1.0.4.2
How to fix
Upgrade to a fixed version: NETGEAR Gc108P Firmware 1.0.8.2; NETGEAR Gc108Pp Firmware 1.0.8.2; NETGEAR Gs108T Firmware 7.0.7.2; NETGEAR Gs110Tp Firmware 7.0.7.2; NETGEAR Gs110Tpp Firmware 7.0.7.2; NETGEAR Gs110Tup Firmware 1.0.5.3; NETGEAR Gs308T Firmware 1.0.3.2; NETGEAR Gs310Tp Firmware 1.0.3.2; NETGEAR Gs710Tup Firmware 1.0.5.3; NETGEAR Gs716Tp Firmware 1.0.4.2; NETGEAR Gs716Tpp Firmware 1.0.4.2; NETGEAR Gs724Tp Firmware 2.0.6.3. Check the vendor advisory for mitigations.
References
- https://gynvael.coldwind.pl/?id=740
- https://kb.netgear.com/000063978/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Smart-Switches-PSV-2021-0140-PSV-2021-0144-PSV-2021-0145
- https://gynvael.coldwind.pl/?id=740
- https://kb.netgear.com/000063978/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Smart-Switches-PSV-2021-0140-PSV-2021-0144-PSV-2021-0145
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