What’s Vulnerable › Vulnerabilities

CVE-2013-5661

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-05 · updated 2026-06-16
• Weakness: CWE-290

Description

Cache Poisoning issue exists in DNS Response Rate Limiting.

Affected products

• ISC BIND: from 9.8.0 through 9.9.0
• CZ.NIC knot-resolver: before 1.3.0 — fixed in 1.3.0
• NLnet Labs NSD: 3.2.15
• Red Hat Enterprise Linux: 6.0, 7.0

How to fix

Upgrade to a fixed version: CZ.NIC knot-resolver 1.3.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-5661
• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2013-5661
• https://security-tracker.debian.org/tracker/CVE-2013-5661
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-5661
• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2013-5661
• https://security-tracker.debian.org/tracker/CVE-2013-5661

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