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CVE-2019-10190

HIGHCVSS 7.5/10EPSS 1.99%

Last modified

CVE-2019-10190 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

Description

A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability
1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
NicKnot Resolver<= 3.2.0
NicKnot Resolver>= 4.0.0, < 4.1.0
FedoraprojectFedora29
FedoraprojectFedora30

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-10190?
A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.
How severe is CVE-2019-10190?
CVE-2019-10190 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.
How do I fix CVE-2019-10190?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-10190?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST