CVE-2024-51138

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-27 · updated 2026-07-05
Weakness: CWE-121

Description

Vigor165/166 4.2.7 and earlier; Vigor2620/LTE200 3.9.8.9 and earlier; Vigor2860/2925 3.9.8 and earlier; Vigor2862/2926 3.9.9.5 and earlier; Vigor2133/2762/2832 3.9.9 and earlier; Vigor2135/2765/2766 4.4.5. and earlier; Vigor2865/2866/2927 4.4.5.3 and earlier; Vigor2962 4.3.2.8 and earlier; Vigor3912 4.3.6.1 and earlier; Vigor3910 4.4.3.1 and earlier a stack-based buffer overflow vulnerability has been identified in the URL parsing functionality of the TR069 STUN server. This flaw occurs due to insufficient bounds checking on the amount of URL parameters, allowing an attacker to exploit the overflow by sending a maliciously crafted request. Consequently, a remote attacker can execute arbitrary code with elevated privileges.

Affected products

DrayTek Vigor1000B Firmware: before 4.4.3.2 — fixed in 4.4.3.2
DrayTek Vigor2133 Firmware: before 3.9.9.2 — fixed in 3.9.9.2
DrayTek Vigor2135 Firmware: before 4.4.5.5 — fixed in 4.4.5.5
DrayTek Vigor2620 Firmware: before 3.9.9.1 — fixed in 3.9.9.1
DrayTek Vigor2762 Firmware: before 3.9.9.2 — fixed in 3.9.9.2
DrayTek Vigor2763 Firmware: before 4.4.5.5 — fixed in 4.4.5.5
DrayTek Vigor2765 Firmware: before 4.4.5.5 — fixed in 4.4.5.5
DrayTek Vigor2766 Firmware: before 4.4.5.5 — fixed in 4.4.5.5
DrayTek Vigor2832 Firmware: before 3.9.9.2 — fixed in 3.9.9.2
DrayTek Vigor2860 Firmware: before 3.9.8.3 — fixed in 3.9.8.3
DrayTek Vigor2862 Firmware: before 3.9.9.8 — fixed in 3.9.9.8
DrayTek Vigor2865 Firmware: before 4.4.5.8 — fixed in 4.4.5.8
DrayTek Vigor2866 Firmware: before 4.4.5.8 — fixed in 4.4.5.8
DrayTek Vigor2915 Firmware: before 4.4.5 — fixed in 4.4.5
DrayTek Vigor2925 Firmware: before 3.9.8.3 — fixed in 3.9.8.3
DrayTek Vigor2926 Firmware: before 3.9.9.8 — fixed in 3.9.9.8
DrayTek Vigor2927 Firmware: before 4.4.5.8 — fixed in 4.4.5.8
DrayTek Vigor2952 Firmware: before 3.9.8.5 — fixed in 3.9.8.5
DrayTek Vigor2962 Firmware: before 4.3.2.9; from 4.4.3 before 4.4.3.2 — fixed in 4.3.2.9, 4.4.3.2
DrayTek Vigor3220 Firmware: before 3.9.8.5 — fixed in 3.9.8.5
DrayTek Vigor3910 Firmware: before 4.3.2.9; from 4.4.3 before 4.4.3.2 — fixed in 4.3.2.9, 4.4.3.2
DrayTek Vigor3912 Firmware: before 4.4.3.2 — fixed in 4.4.3.2
DrayTek Vigorlte200 Firmware: before 3.9.9.1 — fixed in 3.9.9.1

How to fix

Upgrade to a fixed version: DrayTek Vigor1000B Firmware 4.4.3.2; DrayTek Vigor2133 Firmware 3.9.9.2; DrayTek Vigor2135 Firmware 4.4.5.5; DrayTek Vigor2620 Firmware 3.9.9.1; DrayTek Vigor2762 Firmware 3.9.9.2; DrayTek Vigor2763 Firmware 4.4.5.5; DrayTek Vigor2765 Firmware 4.4.5.5; DrayTek Vigor2766 Firmware 4.4.5.5; DrayTek Vigor2832 Firmware 3.9.9.2; DrayTek Vigor2860 Firmware 3.9.8.3; DrayTek Vigor2862 Firmware 3.9.9.8; DrayTek Vigor2865 Firmware 4.4.5.8. Check the vendor advisory for mitigations.

References

https://medium.com/faraday/advisory-multiple-vulnerabilities-affecting-draytek-routers-78a6cb8b3946

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