CVE-2025-8677 Resource exhaustion via malformed DNSKEY handling
Attackers can cause CPU exhaustion and service denial by sending queries for malformed DNSKEY records in crafted zones.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-8677?
CVE-2025-8677 is a high-severity denial of service vulnerability in ISC BIND 9, published on 22 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion. This issue affects BIND 9 versions 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Weakness: CWE-405
Which versions are affected by CVE-2025-8677?
Linux distribution packages (32)
bind AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-chroot AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-devel AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-doc AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-utils AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-doc AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-libs AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-license AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind-utils AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
python3-bind AlmaLinux:9 | All versions | 32:9.16.23-40.el9_8.1 |
bind Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-chroot Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-doc Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-utils Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-utils-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-libs Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-libs-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-license Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-utils Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-utils-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
python3-bind Red Hat:enterprise_linux:9::appstream | All versions | 32:9.16.23-40.el9_8.1 |
bind-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-debugsource Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-devel Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-dnssec-utils-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-doc Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-libs Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-libs-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind-utils-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 32:9.16.23-40.el9_8.1 |
bind Rocky Linux:9 | All versions | 2:9.16.23-40.el9_8.1 |
How do I fix CVE-2025-8677?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-8677 being exploited?
There is no known exploitation of CVE-2025-8677 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2025-8677, ALSA-2026:18786, AZL-68733, AZL-68742, BELL-CVE-2025-8677, CLSA-2026-1782147734 and 7 more.