CyberSecBulletin
CVE-2022-27644NVD status: Modified

R6700v3: Improper Certificate Validation

Published Updated By the CyberSecBulletin desk

CVE-2022-27644 is a high-severity improper certificate validation vulnerability in R6700v3 from NETGEAR, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected R6700v3 versions: 1.0.4.120_10.0.91. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.34% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update R6400 Firmware to 1.0.4.126 or a later version.
  2. Update R6700 Firmware to 1.0.4.126 or a later version.
  3. Update R6900p Firmware to 1.3.3.148 or a later version.
  4. Read the advisory on kb.netgear.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
NETGEARR6700v31.0.4.120_10.0.91Not stated
NETGEARR6400 Firmwarebefore 1.0.4.1261.0.4.126
NETGEARR6700 Firmwarebefore 1.0.4.1261.0.4.126
NETGEARR6900p Firmwarebefore 1.3.3.1481.3.3.148
NETGEARR7000 Firmwarebefore 1.0.11.1341.0.11.134
NETGEARR7000p Firmwarebefore 1.3.3.1481.3.3.148
NETGEARR7850 Firmwarebefore 1.0.5.841.0.5.84
NETGEARR7960p Firmwarebefore 1.4.3.881.4.3.88
NETGEARR8000 Firmwarebefore 1.0.4.841.0.4.84
NETGEARR8000p Firmwarebefore 1.4.3.881.4.3.88
NETGEARRax200 Firmwarebefore 1.0.6.1381.0.6.138
NETGEARRax75 Firmwarebefore 1.0.6.1381.0.6.138
NETGEARRax80 Firmwarebefore 1.0.6.1381.0.6.138
NETGEARRs400 Firmwarebefore 1.5.1.861.5.1.86
NETGEARCbr40 Firmwarebefore 2.5.0.282.5.0.28
NETGEARLbr1020 Firmwarebefore 2.7.4.22.7.4.2
NETGEARLbr20 Firmwarebefore 2.7.4.22.7.4.2
NETGEARRbr10 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbr20 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbr40 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbr50 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbs10 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbs20 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbs40 Firmwarebefore 2.7.4.242.7.4.24
NETGEARRbs50 Firmwarebefore 2.7.4.242.7.4.24

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.18.8HighNVD
CVSS 3.05.0MediumCNA (trendmicro.com)

Official description

This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R6700v3 1.0.4.120_10.0.91 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via HTTPS. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-15797.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

How developers prevent this class of flaw

  • Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
  • If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.

More Improper Certificate Validation vulnerabilities (CWE-295)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in R6700v3

All R6700v3 vulnerabilities

Recent Improper Certificate Validation vulnerabilities

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