Is CVE-2018-21029 in the CISA KEV catalog?

No. CVE-2018-21029 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-21029?

CVE-2018-21029 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-21029?

CVE-2018-21029 has an EPSS score of 3.14% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-21029?

Upgrade systemd on debian 11 to 244-1 or later.

CVE & CISA-KEV Catalog

CVE-2018-21029

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

Description

systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)

CWE-295Improper Certificate Validation

How to fix

Remediation Available

systemdDebian

Fixed in:244-1CVE-2018-21029

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.14%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch2

Exploit2

Third-Party Advisory4

Other references1

lists.fedoraproject.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.