HighFix available
dnsmasq — security advisory
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
- Products
- dnsmasq
- Affected versions
- Not specified
- Fixed versions
- 2.83-r0
- CVEs
- CVE-2020-25681
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:08 UTC · Revision 1
Source evidence
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
osv:ALPINE-CVE-2020-25681
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
dnsmasq
Fixed versions: 2.83-r0
Complete source record
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"modified": "2026-10-26T11:17:55.155245236Z",
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