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Fencer Intel
high 7.5

CVE-2018-20679 json

An issue was discovered in BusyBox before 1.30.0.

published 7y ago modified 4mo ago also EUVD-2018-13227

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
7.7%
EPSS 7.7% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.

Patch / fix

  • busybox busybox 1.30.0
  • busybox Debian 14, Debian 13, Debian 12 1:1.30.1-1

debian advisories DEBIAN-CVE-2018-20679

  • busybox Ubuntu 14.04 LTS 1:1.21.0-1ubuntu1.4
  • busybox Ubuntu 16.04 LTS 1:1.22.0-15ubuntu1.4
  • busybox Ubuntu 18.04 LTS 1:1.27.2-2ubuntu3.2

ubuntu advisories UBUNTU-CVE-2018-20679

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • busybox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 1.35.0-4.3.1
  • busybox SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 1.35.0-150400.3.3.1
  • busybox SLES 15 SP2-BCL, SLES 15 SP1-BCL, SLE Real Time 15 SP2 +18 more 1.34.1-4.9.1
  • busybox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +9 more 1.26.2-4.5.1

suse advisories SUSE-SU-2022:4253-1SUSE-SU-2022:3959-1SUSE-SU-2022:0135-2SUSE-SU-2022:0135-1SUSE-SU-2021:3531-1

  • busybox openSUSE Tumbleweed 1.35.0-1.1
  • busybox openSUSE Leap 15.3 1.34.1-4.9.1
  • virtualbox openSUSE Leap 15.3 6.1.34-lp153.2.27.2
  • virtualbox-kmp openSUSE Leap 15.3 6.1.34-lp153.2.27.1
  • busybox openSUSE Leap 15.2 1.26.2-lp152.5.3.1
  • busybox openSUSE Leap 15.3 1.26.2-4.5.1

opensuse advisories openSUSE-SU-2024:11738-1openSUSE-SU-2022:0135-1openSUSE-SU-2021:1408-1openSUSE-SU-2021:3531-1

  • busybox Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.29.3-r10

alpine advisories ALPINE-CVE-2018-20679

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2018-20679 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.

Check with Fencer

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-2018-20679 updated cvss 4.3

busybox: Out of bounds read in udhcp components resulting in information disclosure

  • Red Hat Enterprise Linux 5 busybox Red Hat Enterprise Linux 6 busybox, busybox-petitboot
    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-21-054-03 updated cvss 7.5

Advantech Spectre RT Industrial Routers

  • Advantech Spectre RT ERT351 <= 5.1.3
    affected: mitigation “For additional information, please see Advantech Security Advisory SA-2021-01-01” ep.advantech-bb.cz

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

7.69% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.busybox.net https://bugs.busybox.net/show_bug.cgi?id=11506 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

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.