CVE-2023-33778: draytek myvigor Use of Hard-coded Credentials
Vulnerability summary
CVE-2023-33778 is a critical (CVSS 9.8) Use of Hard-coded Credentials vulnerability in draytek myvigor. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 47.6% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 01-06-2023PublishedVulnerability first disclosed.
- 09-01-2025Last modifiedVulnerability information updated.
Description
Draytek Vigor Routers firmware versions below 3.9.6/4.2.4, Access Points firmware versions below v1.4.0, Switches firmware versions below 2.6.7, and Myvigor firmware versions below 2.3.2 were discovered to use hardcoded encryption keys which allows attackers to bind any affected device to their own account. Attackers are then able to create WCF and DrayDDNS licenses and synchronize them from the website.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.59%
Chance of exploitation in the next 30 days
Percentile
48%
Versus all other CVEs
30-day change
0.00 pp
From 0.59% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 found6D028709D39458F5Ab95B3Ea211225Ef
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Draytek72 products
- myvigor< 2.3.2
- vigor1000b_firmware< 3.9.6 | ≥ 4.0.0, < 4.2.4
- vigor130_firmware< 3.9.6 | ≥ 4.0.0, < 4.2.4
- vigor165_firmware< 3.9.6 | ≥ 4.0.0, < 4.2.4
- vigor166_firmware< 3.9.6 | ≥ 4.0.0, < 4.2.4
1 vendor · 72 products