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CVE-2018-10920

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows...

7.5 HighPublic exploitFix available

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

3.24%Down 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.5

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
CVE-2018-10920
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2018-2974 7.5

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
EUVD-2018-2974
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-xv4h-w5rx-q9c8 6.8

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows...

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
GHSA-xv4h-w5rx-q9c8
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Weakness
CWE-20
Updated
2026-11-02
NVD 6.8

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
CVE-2018-10920
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-20
Updated
2026-11-02
OSV 6.8

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
CVE-2018-10920
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2018-10920 6.8

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
DEBIAN-CVE-2018-10920
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2018-10920 6.8

Improper input validation bug in DNS resolver component of Knot Resolver before 2.4.1 allows remote attacker to poison cache.

Record
UBUNTU-CVE-2018-10920
CVSS 3.1
6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
knot-resolver
Debian:12
 before 2.4.1-1
2.4.1-1
knot-resolver
Debian:13
 before 2.4.1-1
2.4.1-1
knot-resolver
Debian:14
 before 2.4.1-1
2.4.1-1
knot-resolver
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.0.0~beta2-123-g6134920-11.0.0~beta3-11.0.0~beta3-1ubuntu0.1~esm1
 None known
knot-resolver
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.3.3-11.5.0-41.5.1-11.5.2-12.0.0-3
Show 4 moreShow less
2.1.0-12.1.0-22.1.1-12.1.1-1ubuntu0.1~esm2
 None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubshutingrz/CVE-2018-10920_PoC2019-01-25

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-10920 is a high vulnerability (CVSS 7.5) in Nic Knot Resolver, published August 2, 2018. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 3.24%, the 88th percentile. Fixed in knot-resolver 2.4.1-1.

References

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