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MEDIUM

CVE-2020-25211

CVSS v3

6

MEDIUM

EPSS Score

0.6 %

exploit probability, as of 2026-10-18

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-2020-25211 Red Hat Product Security991 products fixed · 32 known affected

    kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c

    kernel.src as a component of Red Hat Enterprise Linux 5 · kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6

  • RHSA-2021:2355 Red Hat Product Security99 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:2164 Red Hat Product Security94 products fixed

    Red Hat Security Advisory: kernel security update

  • RHSA-2021:1531 Red Hat Product Security120 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:0856 Red Hat Product Security155 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:0857 Red Hat Product Security30 products fixed

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

7 more advisories

Full record on NVD

Description

In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.

Technical details

Published
2020-09-09

Frequently asked questions

What is CVE-2020-25211?

In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.

Is CVE-2020-25211 actively exploited?

Active exploitation of CVE-2020-25211 has not been confirmed. Its EPSS score was 0.6% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25211?

CVE-2020-25211 has a CVSS v3 base score of 6 (MEDIUM severity).

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