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Fencer Vulns
medium 5.5

CVE-2021-20269 json

A flaw was found in the permissions of a log file created by kexec-tools.

published 2022-03-09 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7704

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

A flaw was found in the permissions of a log file created by kexec-tools. This flaw allows a local unprivileged user to read this file and leak kernel internal information from a previous panic. The highest threat from this vulnerability is to confidentiality. This flaw affects kexec-tools shipped by Fedora versions prior to 2.0.21-8 and RHEL versions prior to 2.0.20-47.

Patch / fix

  • kexec-tools_project kexec-tools 2.0.20-47, 2.0.21-8
  • kexec-tools RHEL 8 2.0.20-57.el8

red hat advisories RHSA-2021:4404

  • kexec-tools Rocky Linux 8 2.0.20-57.el8

rocky linux advisories RLSA-2021:4404

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20269 updated cvss 4.7

kexec-tools: incorrect permissions on kdump dmesg file

  • Red Hat Enterprise Linux 6 kexec-tools
    affected: workaround, no fix planned “The kexec service can be disabled until the kexec-tools package are updated on the system. No reboot is required for these changes to take effect.”
  • Red Hat Enterprise Linux 7 kexec-tools, kexec-tools-eppic, kexec-tools-anaconda-addon
    affected: workaround, no fix available “The kexec service can be disabled until the kexec-tools package are updated on the system. No reboot is required for these changes to take effect.”
  • Red Hat Enterprise Linux BaseOS (v. 8) kexec-tools 2.0.20-57.el8
    fixed: vendor fix “The kexec service can be disabled until the kexec-tools package are updated on the system. No reboot is required for these changes to take effect.” RHSA-2021:4404
  • Red Hat Enterprise Linux 9 kexec-tools
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-166-10 updated cvss 5.5

Siemens SIMATIC S7-1500 TM MFP BIOS

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a kexec-tools

Classification

Weakness
  • CWE-276 Incorrect Default Permissions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.