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

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

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-2025-40776

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...

SUSE CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

DEBIAN-CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

UBUNTU-CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

Security update for dnsmasq

This update for dnsmasq fixes the following issues: Version update to 2.90: CVE-2023-50387: Fixed a Denial Of Service while trying to validate specially crafted DNSSEC responses. bsc1219823 CVE-2023-50868: Fixed a Denial Of Service while trying to validate specially crafted DNSSEC responses...

Huawei EulerOS: Security Advisory for dnsmasq (EulerOS-SA-2024-2264)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2024 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

CLSA-2024-1720179161 dnsmasq: Fix of CVE-2023-28450

change EDNS.0 UDP packet size from 4096 to 1232 - CVE-2023-28450...

Moderate: Red Hat Security Advisory: dnsmasq security update

An update for dnsmasq is now available for Red Hat Enterprise Linux 9.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

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...

USN-6657-2: Dnsmasq vulnerabilities

USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Dnsmasq icorrectly handled validating DNSSEC...

dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232

A flaw was found in Dnsmasq. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020...

Important: Red Hat Security Advisory: dnsmasq security and bug fix update

An update for dnsmasq is now available for Red Hat Enterprise Linux 8.8 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

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...

CentOS 8 : dnsmasq (CESA-2023:7046)

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2023:7046 advisory. - An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020...