VDB
ALPINE-CVE-2020-25686
ALPINE-CVE-2020-25686
PUBLISHED
CVSS 3.700000047683716 LOW
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Risk Scores
CVSS v3.1
3.700000047683716
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.10 | dnsmasq | 2.72-r1, 2.72-r0, 2.71-r0 |
| Alpine:v3.11 | dnsmasq | 2.52-r1, 2.55-r0, 2.52-r1 |
| Alpine:v3.16 | dnsmasq | 0, 0, 0 |
| Alpine:v3.22 | dnsmasq | 0, 0, 0 |
| Alpine:v3.12 | dnsmasq | 2.77-r0, 2.78-r0, 2.78-r1 |
| Alpine:v3.21 | dnsmasq | 0, 0, 0 |
| Alpine:v3.14 | dnsmasq | 2.62-r0, 0, 2.46-r0 |
| Alpine:v3.19 | dnsmasq | 0, 0, 0 |
| Alpine:v3.18 | dnsmasq | 0, 0, 0 |
| Alpine:v3.20 | dnsmasq | 0, 0, 0 |
| Alpine:v3.17 | dnsmasq | 0, 0, 0 |
| Alpine:v3.23 | dnsmasq | 0, 0, 0 |
| Alpine:v3.15 | dnsmasq | 0, 0, 0 |
| Alpine:v3.13 | dnsmasq | 2.50-r1, 2.70-r0, 2.76-r4 |
Timeline
- Jan 20, 2021 CVE Published
- Dec 3, 2025 CVE Updated
- Apr 30, 2026 Distribution Patch