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Alerts This Week
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Debian: Unbound Severe Denial of Service Vulnerability DSA-5988-2

debian
Calendar Grey August 27, 2025
Debian Logo
Vulnerable DNS server identified with serious security flaws, leading to potential threats of service disruption and data manipulation.
Multiple security issues were discovered in Unbound, a validating, recursive, caching DNS resolver, which may result in denial of service or cache poisoning via the "rebirthday att...

Summary

Multiple security issues were discovered in Unbound, a validating,
recursive, caching DNS resolver, which may result in denial of service
or cache poisoning via the "rebirthday attack".

For the oldstable distribution (bookworm), these problems have been fixed
in version 1.17.1-2+deb12u3.

We recommend that you upgrade your unbound packages.

For the detailed security status of unbound please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/unbound

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/



Severity
critical
Lowest
Low
Medium
High
Critical

Package: unbound
CVE ID: CVE-2024-8508 CVE-2024-33655 CVE-2025-5994

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