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HIGH

CVE-2020-14305

CVSS v3

8.1

HIGH

EPSS Score

5.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2020-14305 Red Hat Product Security204 products fixed · 1 known affected

    kernel: memory corruption in Voice over IP nf_conntrack_h323 module

    kernel.src as a component of Red Hat Enterprise MRG 2

  • ICSA-24-074-07 CISA1 known affected

    Siemens SIMATIC

    Siemens SIMATIC RF160B (6GT2003-0FA00): <V2.2

  • SSA-770721 Siemens ProductCERT1 known affected

    SSA-770721: Multiple Vulnerabilities in SIMATIC RF160B before V2.2

    SIMATIC RF160B (6GT2003-0FA00)

  • RHSA-2020:4060 Red Hat Product Security174 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2020:4062 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

Full record on NVD

Description

An out-of-bounds memory write flaw was found in how the Linux kernel’s Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Technical details

Published
2020-12-02

Frequently asked questions

What is CVE-2020-14305?

An out-of-bounds memory write flaw was found in how the Linux kernel’s Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Is CVE-2020-14305 actively exploited?

Active exploitation of CVE-2020-14305 has not been confirmed. Its EPSS score was 5.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-14305?

CVE-2020-14305 has a CVSS v3 base score of 8.1 (HIGH severity).

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