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Fencer Intel
medium 5.3

CVE-2020-12831 json

An issue was discovered in FRRouting FRR (aka Free Range Routing) through 7.3.1.

published 6y ago modified 4mo ago also EUVD-2020-5113

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

An issue was discovered in FRRouting FRR (aka Free Range Routing) through 7.3.1. When using the split-config feature, the init script creates an empty config file with world-readable default permissions, leading to a possible information leak via tools/frr.in and tools/frrcommon.sh.in. NOTE: some parties consider this user error, not a vulnerability, because the permissions are under the control of the user before any sensitive information is present in the file

Patch / fix

  • frr RHEL 8 7.0-10.el8
  • frr-contrib RHEL 8 7.0-10.el8

red hat advisories RHSA-2020:4619

  • frr openSUSE Tumbleweed 7.5.1-3.1

opensuse advisories openSUSE-SU-2024:10583-1

  • frr-contrib AlmaLinux 8 7.0-10.el8

almalinux advisories ALSA-2020:4619

Is CVE-2020-12831 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-12831 updated cvss 5.3

frr: default permission issue eases information leaks

  • Red Hat Enterprise Linux AppStream (v. 8) frr 7.0-10.el8, frr-contrib 7.0-10.el8
    fixed: vendor fix RHSA-2020:4619

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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1830805 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Intel 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.