FICHE CVE

CVE-2020-25686

Publiée le 2021-01-20 · Dernière modification le 2026-06-17

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.

CVSS 3.13.7 FAIBLE

Type de faiblesse

CWE-358 Contournement d'authentification par usurpation · CWE-290

Publiée2021-01-20

Dernière modification2026-06-17

DÉTAIL DU VECTEUR CVSS

Vecteur d'attaqueRéseau

Complexité d'attaqueÉlevée

Privilèges requisAucun

Interaction utilisateurAucune

PortéeInchangée

Impact sur la confidentialitéAucun

Impact sur l'intégritéFaible

Impact sur la disponibilitéAucun

CVE-2020-25686

DÉTAIL DU VECTEUR CVSS

RÉFÉRENCES