Bind 9
Monthly
Denial of service in ISC BIND 9 resolvers can be triggered when a SIG(0)-signed DNS message is dropped under recursive-clients pressure, creating a race that leads to a use-after-free on the discarded message buffer. Affects BIND 9.20.0-9.20.22, 9.21.0-9.21.21, and the 9.20.9-S1-9.20.22-S1 subscription branch; no public exploit identified at time of analysis and the issue is not on CISA KEV.
Remote denial of service in ISC BIND 9 named allows unauthenticated attackers to trigger assertion failures and crash the resolver by sending DNS messages with non-Internet classes (CHAOS, HESIOD) or meta-classes (ANY, NONE) through code paths involving recursion, dynamic UPDATE, NOTIFY, or IN-specific record processing in non-IN data. The flaw affects BIND 9.11.0 through 9.21.21 across both open-source and Supported Preview (S1) branches, with no public exploit identified at time of analysis. CVSS 7.5 reflects high availability impact with network-reachable, low-complexity, unauthenticated exploitation.
Memory corruption in ISC BIND 9's DNS-over-HTTPS (DoH) implementation lets remote attackers trigger a use-after-free (CWE-416) by interacting with the DoH endpoint, affecting BIND 9.20.0-9.20.22, 9.21.0-9.21.21, and the 9.20.9-S1-9.20.22-S1 subscription builds; the older 9.18.x branch is explicitly not affected. The vendor scores it CVSS 9.8 (AV:N/AC:L/PR:N/UI:N), implying unauthenticated remote impact, though CISA's SSVC rates technical impact as only 'partial' and exploitation as 'none'. There is no public exploit identified at time of analysis and EPSS is very low (0.02%, 7th percentile), indicating no observed exploitation activity.
Denial of service in ISC BIND 9 DNS servers configured with TKEY GSS-API authentication allows remote unauthenticated attackers to trigger excessive memory consumption by sending maliciously crafted packets. The flaw primarily impacts Active Directory-integrated DNS and Kerberos-secured DNS deployments, where service exhaustion can disrupt authentication, name resolution, and dependent enterprise services. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV, but the CVSS 7.5 score and network-reachable, unauthenticated nature warrant timely patching.
A use-after-return vulnerability in ISC BIND 9's SIG(0) DNS query handler allows an attacker with low-level authentication privileges to manipulate ACL matching logic, potentially bypassing default-allow access controls and gaining unauthorized access to DNS services. The vulnerability affects BIND 9 versions 9.20.0-9.20.20, 9.21.0-9.21.19, and their security branches (9.20.9-S1-9.20.20-S1), while older stable releases (9.18.x) are unaffected. Vendor patches are available, and the moderate CVSS 5.4 score reflects limited technical impact when ACLs are properly configured with fail-secure defaults.
BIND 9 DNS server crashes when processing specially crafted TSIG-authenticated queries containing TKEY records, affecting versions 9.20.0-9.20.20, 9.21.0-9.21.19, and 9.20.9-S1-9.20.20-S1 on Ubuntu, SUSE, and Debian systems. An authenticated attacker with a valid TSIG key can trigger a denial of service by sending a malformed query, disrupting DNS resolution services. A patch is available for affected installations.
Memory exhaustion in BIND 9 resolver allows unauthenticated remote attackers to cause denial of service by querying specially crafted domains, affecting versions 9.20.0-9.20.20, 9.21.0-9.21.19, and 9.20.9-S1-9.20.20-S1. The vulnerability stems from improper memory management (CWE-772) and can be triggered without authentication or user interaction. Patches are available for affected Ubuntu, SUSE, and Debian systems.
BIND resolver servers performing DNSSEC validation can be forced into excessive CPU consumption when encountering a maliciously crafted DNS zone, resulting in denial of service. The vulnerability affects BIND 9 versions from 9.11.0 through current versions across multiple branches (9.16.50, 9.18.46, 9.20.20, 9.21.19) including BIND Supported Preview Edition variants. The CVSS score of 7.5 indicates high availability impact with network-based exploitation requiring no authentication, though no active exploitation (KEV) or proof-of-concept availability has been indicated in the provided data.
Denial of service in ISC BIND 9 resolvers can be triggered when a SIG(0)-signed DNS message is dropped under recursive-clients pressure, creating a race that leads to a use-after-free on the discarded message buffer. Affects BIND 9.20.0-9.20.22, 9.21.0-9.21.21, and the 9.20.9-S1-9.20.22-S1 subscription branch; no public exploit identified at time of analysis and the issue is not on CISA KEV.
Remote denial of service in ISC BIND 9 named allows unauthenticated attackers to trigger assertion failures and crash the resolver by sending DNS messages with non-Internet classes (CHAOS, HESIOD) or meta-classes (ANY, NONE) through code paths involving recursion, dynamic UPDATE, NOTIFY, or IN-specific record processing in non-IN data. The flaw affects BIND 9.11.0 through 9.21.21 across both open-source and Supported Preview (S1) branches, with no public exploit identified at time of analysis. CVSS 7.5 reflects high availability impact with network-reachable, low-complexity, unauthenticated exploitation.
Memory corruption in ISC BIND 9's DNS-over-HTTPS (DoH) implementation lets remote attackers trigger a use-after-free (CWE-416) by interacting with the DoH endpoint, affecting BIND 9.20.0-9.20.22, 9.21.0-9.21.21, and the 9.20.9-S1-9.20.22-S1 subscription builds; the older 9.18.x branch is explicitly not affected. The vendor scores it CVSS 9.8 (AV:N/AC:L/PR:N/UI:N), implying unauthenticated remote impact, though CISA's SSVC rates technical impact as only 'partial' and exploitation as 'none'. There is no public exploit identified at time of analysis and EPSS is very low (0.02%, 7th percentile), indicating no observed exploitation activity.
Denial of service in ISC BIND 9 DNS servers configured with TKEY GSS-API authentication allows remote unauthenticated attackers to trigger excessive memory consumption by sending maliciously crafted packets. The flaw primarily impacts Active Directory-integrated DNS and Kerberos-secured DNS deployments, where service exhaustion can disrupt authentication, name resolution, and dependent enterprise services. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV, but the CVSS 7.5 score and network-reachable, unauthenticated nature warrant timely patching.
A use-after-return vulnerability in ISC BIND 9's SIG(0) DNS query handler allows an attacker with low-level authentication privileges to manipulate ACL matching logic, potentially bypassing default-allow access controls and gaining unauthorized access to DNS services. The vulnerability affects BIND 9 versions 9.20.0-9.20.20, 9.21.0-9.21.19, and their security branches (9.20.9-S1-9.20.20-S1), while older stable releases (9.18.x) are unaffected. Vendor patches are available, and the moderate CVSS 5.4 score reflects limited technical impact when ACLs are properly configured with fail-secure defaults.
BIND 9 DNS server crashes when processing specially crafted TSIG-authenticated queries containing TKEY records, affecting versions 9.20.0-9.20.20, 9.21.0-9.21.19, and 9.20.9-S1-9.20.20-S1 on Ubuntu, SUSE, and Debian systems. An authenticated attacker with a valid TSIG key can trigger a denial of service by sending a malformed query, disrupting DNS resolution services. A patch is available for affected installations.
Memory exhaustion in BIND 9 resolver allows unauthenticated remote attackers to cause denial of service by querying specially crafted domains, affecting versions 9.20.0-9.20.20, 9.21.0-9.21.19, and 9.20.9-S1-9.20.20-S1. The vulnerability stems from improper memory management (CWE-772) and can be triggered without authentication or user interaction. Patches are available for affected Ubuntu, SUSE, and Debian systems.
BIND resolver servers performing DNSSEC validation can be forced into excessive CPU consumption when encountering a maliciously crafted DNS zone, resulting in denial of service. The vulnerability affects BIND 9 versions from 9.11.0 through current versions across multiple branches (9.16.50, 9.18.46, 9.20.20, 9.21.19) including BIND Supported Preview Edition variants. The CVSS score of 7.5 indicates high availability impact with network-based exploitation requiring no authentication, though no active exploitation (KEV) or proof-of-concept availability has been indicated in the provided data.