VDB
CISA-2021-3448
CISA-2021-3448
PUBLISHED
CVSS 4 MEDIUM
Reported by redhat · Published April 8, 2021
A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.
Risk Scores
CVSS 3.1
4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| n/a | dnsmasq | dnsmasq 2.85 |
| n/a | dnsmasq | dnsmasq 2.85, * |
Timeline
- Apr 8, 2021 CVE Published
- Dec 3, 2025 CVE Updated
- Apr 26, 2026 Security Advisory
References
- x_refsource_MISC
- FEDORA-2021-62a5062b2d vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-9433bedebd vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-5cd2571751 vendor-advisoryx_refsource_FEDORA
- GLSA-202105-20 vendor-advisoryx_refsource_GENTOO
- x_refsource_MISC