Vulnerability in Arista Eos
CVE-2020-25686
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.
EPSS: 0.049 (91.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Arista Eos
- Thekelleys Dnsmasq
- Debian Debian_linux — versions 10.0
- Fedoraproject Fedora — versions 32, 33
- N/a Dnsmasq — versions dnsmasq 2.83
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2020-25686?
- CVE-2020-25686 is a low-severity vulnerability in Arista Eos, classified under CWE-358. CVSS score: 3.7/10. Published 2021-01-20.
- How severe is CVE-2020-25686?
- Low severity. CVSS v3 base score is 3.7 out of 10.
- Is CVE-2020-25686 known to be exploited?
- 24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.