Dnsmasq

Remote denial-of-service and limited information disclosure in dnsmasq's extract_addresses() function allows attackers controlling or able to inject DNS responses to crash the daemon by sending a malformed DNS record whose declared rdlen pushes extract_name() past the record boundary, triggering a heap out-of-bounds read. The flaw affects dnsmasq 2.93 and downstream packages from Red Hat, SUSE, Ubuntu, and Pi-hole FTL. No public exploit identified at time of analysis, EPSS exploitation probability is 0.03% (9th percentile), and CISA SSVC rates exploitation as 'none' with only partial technical impact.

Heap-based buffer overflow in dnsmasq's DHCPv6 implementation enables local attackers to execute arbitrary code with root privileges. Affects dnsmasq 2.93 (and potentially earlier 2.92 branch based on NixOS patching activity). CERT/CC issued VU#471747, and upstream published CVE-specific advisory at thekelleys.org.uk/dnsmasq/CVE/. NixOS patch activity (PR #519082, #519093) indicates real-world remediation effort. No CISA KEV listing or public POC identified at time of analysis, suggesting limited active exploitation despite high CVSS 8.4 score.

Heap-based out-of-bounds read in dnsmasq DNSSEC validation allows remote unauthenticated attackers to trigger a denial of service by sending a crafted DNS packet. The vulnerability affects dnsmasq 2.93 and potentially earlier versions; CVSS 5.3 with network-based access vector indicates moderate severity. No public exploit code or active exploitation confirmed at time of analysis.

Remote unauthenticated attackers can crash dnsmasq DNS servers via crafted packets exploiting DNSSEC validation logic. The vulnerability affects dnsmasq 2.93 with CVSS 7.5 (high severity). Upstream fix is available in version 2.92rel2 per NixOS packaging commits, though official vendor release status requires confirmation. No public exploit identified at time of analysis, with CERT/CC tracking (VU#471747) suggesting coordinated disclosure.

Heap buffer overflow in dnsmasq's extract_name() function allows remote attackers to write out-of-bounds on the heap, enabling DNS cache poisoning that redirects lookups to attacker-controlled IP addresses or causes denial of service. The flaw stems from a bigname namebuffer sized for wire-form domain names (MAXDNAME) instead of the larger escaped internal representation (MAXDNAME*2 + 1). EPSS is low (0.03%, 9th percentile) with no public exploit identified at time of analysis, but multiple major distributions (Red Hat, SUSE, Ubuntu) have shipped patches reflecting widespread downstream exposure.

An issue was discovered in Dnsmasq before 2.90. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.

A flaw was found in dnsmasq in versions before 2.85. Rated medium severity (CVSS 4.0), this vulnerability is remotely exploitable, no authentication required. Public exploit code available.

Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DNS response. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 57.8%.

Integer underflow in the add_pseudoheader function in dnsmasq before 2.78 , when the --add-mac, --add-cpe-id or --add-subnet option is specified, allows remote attackers to cause a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 16.9%.

Memory leak in dnsmasq before 2.78, when the --add-mac, --add-cpe-id or --add-subnet option is specified, allows remote attackers to cause a denial of service (memory consumption) via vectors. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 53.3%.

dnsmasq before 2.78, when configured as a relay, allows remote attackers to obtain sensitive memory information via vectors involving handling DHCPv6 forwarded requests. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and EPSS exploitation probability 11.0%.

Stack-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DHCPv6 request. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted IPv6 router advertisement request. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 92.8%.

In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 79.3% and no vendor patch available.

Dnsmasq before 2.76 allows remote servers to cause a denial of service (crash) via a reply with an empty DNS address that has an (1) A or (2) AAAA record defined locally. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The tcp_request function in Dnsmasq before 2.73rc4 does not properly handle the return value of the setup_reply function, which allows remote attackers to read process memory and cause a denial of. Rated medium severity (CVSS 6.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Dnsmasq before 2.66test2, when used with certain libvirt configurations, replies to queries from prohibited interfaces, which allows remote attackers to cause a denial of service (traffic. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Dnsmasq before 2.63test1, when used with certain libvirt configurations, replies to requests from prohibited interfaces, which allows remote attackers to cause a denial of service (traffic. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity.