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Fencer Vulns
low 3.5

CVE-2023-3748 json

Inifinite loop in babld message parsing may cause dos

published 2023-07-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44383

cvss
3.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

A flaw was found in FRRouting when parsing certain babeld unicast hello messages that are intended to be ignored. This issue may allow an attacker to send specially crafted hello messages with the unicast flag set, the interval field set to 0, or any TLV that contains a sub-TLV with the Mandatory flag set to enter an infinite loop and cause a denial of service.

Patch / fix

  • frrouting frrouting 8.5
  • frr Debian 12 8.4.4-1.1~deb12u2
  • frr Debian 14, Debian 13 9.1-0.1

debian advisories DEBIAN-CVE-2023-3748

  • frr SLE Module for Server Applications 15 SP6, SLE Module for Server Applications 15 SP5, openSUSE Leap 15.6 +1 more 8.5.6-150500.4.30.1
  • frr SLE Module for Server Applications 15 SP5, openSUSE Leap 15.5 8.4-150500.4.8.1

suse advisories SUSE-SU-2024:4090-1SUSE-SU-2023:3709-1

  • frr openSUSE Tumbleweed 8.4-5.1

opensuse advisories openSUSE-SU-2024:13191-1

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-2023-3748 updated cvss 3.5

frr: Inifinite loop in babld message parsing may cause DoS

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux Red Hat Enterprise Linux 9 frr, frr-selinux
    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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a frr
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.