DEBIAN-CVE-2025-5994
- Source
- https://security-tracker.debian.org/tracker/CVE-2025-5994
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-5994.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2025-5994
- Upstream
- Published
- 2025-07-16T15:15:33Z
- Modified
- 2025-10-15T07:57:06.816805Z
- Severity
-
- 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:C/RE:X/U:X CVSS Calculator
- Summary
- [none]
- Details
-
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 upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.
- References
Affected packages
Debian:11 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source
Debian:12 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source
Debian:13 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source
Debian:14 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source