Severity
3.7LOW
EPSS
0.4%
top 38.63%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 20
Latest updateMay 24
Description
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…
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:NExploitability: 2.2 | Impact: 1.4
Affected Packages4 packages
Also affects: Debian Linux 10.0, Fedora 32, 33
Patches
🔴Vulnerability Details
3📋Vendor Advisories
7Cisco
▶
Red Hat▶
dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker↗2021-01-19
Red Hat▶
dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker↗2021-01-19
Microsoft▶
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↗2021-01-12
💬Community
1Bugzilla▶
CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker↗2020-10-21