CVE-2025-5994

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to...

ALPINE-CVE-2025-5994

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to...

CVE-2025-5994

CVE-2025-5994 describes a rebirthday cache-poisoning risk in ECS-enabled caching resolvers. Affected product: Unbound (if built with ECS support and configured to send ECS data upstream). Root cause: need to segregate outgoing queries by ECS info; otherwise an attacker could exploit DNS transacti...

CVE-2025-5994 Cache poisoning via the ECS-enabled Rebirthday Attack

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to...

CVE-2025-5994

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to...

ALPINE-CVE-2025-40776

A named caching resolver that is configured to send ECS EDNS Client Subnet options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1...

CVE-2025-40776

A named caching resolver that is configured to send ECS EDNS Client Subnet options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1...

PT-2025-29837 · Nlnet +7 · Unbound +7

Name of the Vulnerable Software and Affected Versions: Unbound affected versions not specified Description: A multi-vendor cache poisoning vulnerability, named 'Rebirthday Attack', has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is vulnerable when compiled wi...

PT-2025-29825 · Isc · Bind

Name of the Vulnerable Software and Affected Versions: BIND 9 versions 9.11.3-S1 through 9.16.50-S1 BIND 9 versions 9.18.11-S1 through 9.18.37-S1 BIND 9 versions 9.20.9-S1 through 9.20.10-S1 Description: A named caching resolver configured to send ECS EDNS Client Subnet options may be vulnerable ...

unbound -- Cache poisoning via the ECS-enabled Rebirthday Attack

[email protected] reports: A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet ECS. Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information...

The vulnerability of the EDNS Client Subnet (ECS) DNS-server BIND component, which allows a attacker to cause a service failure.

The vulnerability of the EDNS Client Subnet ECS component of the BIND DNS server is related to an uncontrolled resource consumption. Exploiting this vulnerability could allow a malicious actor to cause service failures through the named parameter...

PT-2024-3867 · Isc · Bind

Name of the Vulnerable Software and Affected Versions: BIND versions 9.11.3-S1 through 9.11.37-S1 BIND versions 9.16.8-S1 through 9.16.45-S1 BIND versions 9.18.11-S1 through 9.18.21-S1 Description: The issue is related to the EDNS Client Subnet ECS component of the BIND DNS server, which can lead...

SUSE CVE-2015-8719

The dissectdnsanswer function in epan/dissectors/packet-dns.c in the DNS dissector in Wireshark 1.12.x before 1.12.9 mishandles the EDNS0 Client Subnet option, which allows remote attackers to cause a denial of service application crash via a crafted packet...

SUSE CVE-2016-7069

An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to th...

SUSE CVE-2019-6468

In BIND Supported Preview Edition, an error in the nxdomain-redirect feature can occur in versions which support EDNS Client Subnet ECS features. In those versions which have ECS support, enabling nxdomain-redirect is likely to lead to BIND exiting due to assertion failure. Versions affected: BIN...

Smart DNS for the New Network: Optimizing Content Delivery

This is the third in a series of blog posts that will discuss how smart DNS resolvers can enhance ongoing internet service provider ISP and mobile network operator MNO network transformation efforts, such as the transition to 5G, better integration of Wi-Fi, and new network designs that optimize...

CVE-2019-6469

An error in the EDNS Client Subnet ECS feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 - 9.11.6-S1 of BIND 9 Supported Preview Edition...

CVE-2019-6469

An error in the EDNS Client Subnet ECS feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 - 9.11.6-S1 of BIND 9 Supported Preview Edition...

CVE-2019-6469

An error in the EDNS Client Subnet ECS feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 - 9.11.6-S1 of BIND 9 Supported Preview Edition...

Design/Logic Flaw

In BIND Supported Preview Edition, an error in the nxdomain-redirect feature can occur in versions which support EDNS Client Subnet ECS features. In those versions which have ECS support, enabling nxdomain-redirect is likely to lead to BIND exiting due to assertion failure. Versions affected: BIN...