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Debian LTS: Unbound CVE-2025-11411 Important DDoS Risk Fix DLA-4365-2

debian lts
Calendar Grey November 30, 2025
Dist Debian Esm H88
Updated unbound packages available for Debian LTS to address CVE-2025-11411 fully and mitigate DoS attacks risk.
Yuxiao Wu, Yunyi Zhang, Baojun Liu and Haixin Duan discovered that the initial fix for CVE-2025-11411 as applied in DLA 4365-1 did not fully fix the vulnerability
Topics%20covered

Topics Covered

security advisory debian important unbound cve-2025-11411 amplification ddos

Summary

Additionally, this update includes a fix for potential amplification
DDoS attacks due to improperly following cleared RD flags.

For Debian 11 bullseye, this problem has been fixed in version
1.13.1-1+deb11u7.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
important
Lowest
Low
Medium
High
Critical

Package: unbound
Version: 1.13.1-1+deb11u7
CVE ID: CVE-2025-11411
Debian Bug: 1121446

Topics%20covered

Topics Covered

security advisory debian important unbound cve-2025-11411 amplification ddos

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