CVE-2020-25686
3.7 · LOWOverview
CVE-2020-25686 is a low-severity vulnerability affecting thekelleys dnsmasq. It was published on January 20, 2021 and has a CVSS 3.1 base score of 3.7 (LOW).
This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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 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.
Remediation
Check the references section for vendor advisories and patches from thekelleys. Update dnsmasq to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| thekelleys | dnsmasq | >= 0, < 2.83 | Affected |
| arista | eos | >= 4.21, < 4.21.14m | Affected |
References
Frequently Asked Questions
What is CVE-2020-25686?
CVE-2020-25686 is a low-severity vulnerability affecting thekelleys dnsmasq. It was published on January 20, 2021 and has a CVSS 3.1 base score of 3.7 (LOW).
How severe is CVE-2020-25686?
This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2020-25686?
Check the references section for vendor advisories and patches from thekelleys. Update dnsmasq to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-25686?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-25686 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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