Dhcp
Monthly
Protection mechanism failure in Windows DHCP Server that enables network-based denial-of-service attacks without requiring authentication or user interaction. An attacker can remotely exploit this vulnerability to render DHCP services unavailable, disrupting network connectivity for affected systems. The high CVSS score of 7.5 and network attack vector indicate significant availability impact, though no confidentiality or integrity compromise occurs.
Network-accessible denial-of-service vulnerability in Windows DHCP Server caused by a protection mechanism failure (CWE-693), allowing unauthenticated attackers to exhaust server availability without requiring authentication or user interaction. The vulnerability affects Windows DHCP Server implementations across multiple versions and has a CVSS severity of 7.5 (High). While the description does not explicitly reference KEV inclusion, active exploitation status, or EPSS data, the low attack complexity (AC:L) and network accessibility (AV:N) combined with no authentication requirements indicate this represents a credible denial-of-service threat to DHCP infrastructure.
In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life. Rated high severity (CVSS 7.4), this vulnerability is no authentication required, low attack complexity. Public exploit code available.
ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. Epss exploitation probability 65.6% and no vendor patch available.
ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash) via an invalid length field in a UDP IPv4 packet. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. Epss exploitation probability 43.4% and no vendor patch available.
libdns in ISC DHCP 4.2.x before 4.2.5-P1 allows remote name servers to cause a denial of service (memory consumption) via vectors involving a regular expression, as demonstrated by a. Rated medium severity (CVSS 4.9), this vulnerability is remotely exploitable. No vendor patch available.
ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable. Epss exploitation probability 12.1% and no vendor patch available.
Multiple memory leaks in ISC DHCP 4.1.x and 4.2.x before 4.2.4-P1 and 4.1-ESV before 4.1-ESV-R6 allow remote attackers to cause a denial of service (memory consumption) by sending many requests. Rated low severity (CVSS 3.3), this vulnerability is low attack complexity. No vendor patch available.
ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a malformed client identifier. Rated medium severity (CVSS 6.1), this vulnerability is low attack complexity. Public exploit code available and EPSS exploitation probability 20.6%.
Buffer overflow in ISC DHCP 4.2.x before 4.2.4-P1, when DHCPv6 mode is enabled, allows remote attackers to cause a denial of service (segmentation fault and daemon exit) via a crafted client. Rated medium severity (CVSS 5.7). No vendor patch available.
Protection mechanism failure in Windows DHCP Server that enables network-based denial-of-service attacks without requiring authentication or user interaction. An attacker can remotely exploit this vulnerability to render DHCP services unavailable, disrupting network connectivity for affected systems. The high CVSS score of 7.5 and network attack vector indicate significant availability impact, though no confidentiality or integrity compromise occurs.
Network-accessible denial-of-service vulnerability in Windows DHCP Server caused by a protection mechanism failure (CWE-693), allowing unauthenticated attackers to exhaust server availability without requiring authentication or user interaction. The vulnerability affects Windows DHCP Server implementations across multiple versions and has a CVSS severity of 7.5 (High). While the description does not explicitly reference KEV inclusion, active exploitation status, or EPSS data, the low attack complexity (AC:L) and network accessibility (AV:N) combined with no authentication requirements indicate this represents a credible denial-of-service threat to DHCP infrastructure.
In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life. Rated high severity (CVSS 7.4), this vulnerability is no authentication required, low attack complexity. Public exploit code available.
ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. Epss exploitation probability 65.6% and no vendor patch available.
ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash) via an invalid length field in a UDP IPv4 packet. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. Epss exploitation probability 43.4% and no vendor patch available.
libdns in ISC DHCP 4.2.x before 4.2.5-P1 allows remote name servers to cause a denial of service (memory consumption) via vectors involving a regular expression, as demonstrated by a. Rated medium severity (CVSS 4.9), this vulnerability is remotely exploitable. No vendor patch available.
ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable. Epss exploitation probability 12.1% and no vendor patch available.
Multiple memory leaks in ISC DHCP 4.1.x and 4.2.x before 4.2.4-P1 and 4.1-ESV before 4.1-ESV-R6 allow remote attackers to cause a denial of service (memory consumption) by sending many requests. Rated low severity (CVSS 3.3), this vulnerability is low attack complexity. No vendor patch available.
ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a malformed client identifier. Rated medium severity (CVSS 6.1), this vulnerability is low attack complexity. Public exploit code available and EPSS exploitation probability 20.6%.
Buffer overflow in ISC DHCP 4.2.x before 4.2.4-P1, when DHCPv6 mode is enabled, allows remote attackers to cause a denial of service (segmentation fault and daemon exit) via a crafted client. Rated medium severity (CVSS 5.7). No vendor patch available.