Critical severity · published Jan 1, 2022
CVE-2021-45956
Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply)
9.8
CVSS
2.7%
EPSS
No
On KEV
Description
Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply). NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DN
Dnsmasq · Thekelleys
2.86 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45956
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-45956
Exploit
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35887
Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-933.yaml
Mailing List
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html
Mailing List
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html
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