CVE-2021-40867 json
Certain NETGEAR smart switches are affected by an authentication hijacking race-condition vulnerability by an unauthenticated attacker who…
published 2021-09-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-28022
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
Certain NETGEAR smart switches are affected by an authentication hijacking race-condition vulnerability by an unauthenticated attacker who uses the same source IP address as an admin in the process of logging in (e.g., behind the same NAT device, or already in possession of a foothold on an admin's machine). This occurs because the multi-step HTTP authentication process is effectively tied only to the source IP address. 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.
Patch / fix
- netgear gc108p_firmware 1.0.8.2
- netgear gc108pp_firmware 1.0.8.2
- netgear gs108t_firmware 7.0.7.2
- netgear gs110tpp_firmware 7.0.7.2
- netgear gs110tp_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 gs724tpp_firmware 2.0.6.3
- netgear gs724tp_firmware 2.0.6.3
- netgear gs728tpp_firmware 6.0.8.2
- netgear gs728tp_firmware 6.0.8.2
- netgear gs750e_firmware 1.0.1.10
- netgear gs752tpp_firmware 6.0.8.2
- netgear gs752tp_firmware 6.0.8.2
- netgear ms510txm_firmware 1.0.4.2
- netgear ms510txup_firmware 1.0.4.2
Exploit prediction
1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gynvael.coldwind.pl https://gynvael.coldwind.pl/?id=741 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:R |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.4 | AV:A/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
gynvael.coldwind.pl
/?id=741
exploit, third-party-advisory
-
kb.netgear.com
/000063978/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Smart-Switches-PSV-2021-0140-PSV-2021-0144-P
vendor-advisory
Sources
- CVE List CVE-2021-40867
- NVD CVE-2021-40867
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