DEBIAN-CVE-2020-25687
- Source
- https://security-tracker.debian.org/tracker/CVE-2020-25687
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-25687.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2020-25687
- Upstream
- Published
- 2021-01-20T17:15:13Z
- Modified
- 2025-09-30T03:54:20Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extractname(), which could be abused to make the code execute memcpy() with a negative size in sortrrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
- References
Affected packages
Debian:11 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:12 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:13 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:14 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source