CyberSecBulletin
CVE-2024-41334NVD status: Modified

Vigor166 Firmware: Improper Certificate Validation

Published Updated By the CyberSecBulletin desk

CVE-2024-41334 is a high-severity improper certificate validation vulnerability in Vigor166 Firmware from DrayTek, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 4.2.6 as the first without the flaw, so updating Vigor166 Firmware to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.38% 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 Vigor166 Firmware to 4.2.6 or a later version.
  2. Update Vigor2620 Firmware to 3.9.8.8 or a later version.
  3. Update Vigorlte200 Firmware to 3.9.8.8 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
DraytekVigor166 Firmwarebefore 4.2.64.2.6
DraytekVigor2620 Firmwarebefore 3.9.8.83.9.8.8
DraytekVigorlte200 Firmwarebefore 3.9.8.83.9.8.8
DraytekVigor2860 Firmwarebefore 3.9.73.9.7
DraytekVigor2925 Firmwarebefore 3.9.73.9.7
DraytekVigor2862 Firmwarebefore 3.9.9.43.9.9.4
DraytekVigor2926 Firmwarebefore 3.9.9.43.9.9.4
DraytekVigor2133 Firmwarebefore 3.9.83.9.8
DraytekVigor2762 Firmwarebefore 3.9.83.9.8
DraytekVigor2832 Firmwarebefore 3.9.83.9.8
DraytekVigor2135 Firmwarebefore 4.4.5.14.4.5.1
DraytekVigor2765 Firmwarebefore 4.4.5.14.4.5.1
DraytekVigor2766 Firmwarebefore 4.4.5.14.4.5.1
DraytekVigor2865 Firmwarebefore 4.4.5.34.4.5.3
DraytekVigor2866 Firmwarebefore 4.4.5.34.4.5.3
DraytekVigor2927 Firmwarebefore 4.4.5.34.4.5.3
DraytekVigor2962 Firmwarebefore 4.3.2.74.3.2.7
DraytekVigor3910 Firmwarebefore 4.3.2.74.3.2.7
DraytekVigor3912 Firmwarebefore 4.3.5.24.3.5.2
DraytekVigor165 Firmwarebefore 4.2.64.2.6

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).

Official description

Draytek devices Vigor 165/166 prior to v4.2.6 , Vigor 2620/LTE200 prior to v3.9.8.8, Vigor 2860/2925 prior to v3.9.7, Vigor 2862/2926 prior to v3.9.9.4, Vigor 2133/2762/2832 prior to v3.9.8, Vigor 2135/2765/2766 prior to v4.4.5.1, Vigor 2865/2866/2927 prior to v4.4.5.3, Vigor 2962/3910 prior to v4.3.2.7, Vigor 3912 prior to v4.3.5.2, and Vigor 2925 up to v3.9.6 were discovered to not utilize certificate verification, allowing attackers to upload crafted APPE modules from non-official servers, leading to arbitrary code execution.

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: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Vigor166 Firmware

All Vigor166 Firmware vulnerabilities

Recent Improper Certificate Validation vulnerabilities

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