CVE-2018-20679

mediumpriority · track · 33OT risk · elevatedEPSS 0.077 · 95 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

7.69% (95th) EPSS

CVSS 5 · medium

Is it mine?

45 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedpepperl_fuchs_psirt
In order to prevent the exploitation of the reported vulnerabilities, we recommend that the affected units be updated with the following three firmware packages: - U-Boot bootloader version 1.36 - System image version 1.52 - Application base version 1.6.11
MitigationSpectre RT ERT351cisa_csaf_ot
For additional information, please see Advantech Security Advisory SA-2021-01-01
https://ep.advantech-bb.cz/support/router-models/download/511/sa-2021-01-fw-5.1.3-and-older-en.pdf

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · Pepperl+Fuchs PSIRT DE

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 3.9 · impact 3.6

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimaryCWE-125USCWE-125USCWE-327US

affected products (45)

Products and version ranges known to be affected.

Spectre RT ERT351: firmware Versions 5.1.3 and priorall versionscisa_csaf_otUS
Advantech Spectre RT ERT351≤ 5.1.3cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 20.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 14.04 LTSfstec_bduRU
ООО «ИнфоВотч АРМА» Программный комплекс «InfoWatch ARMA Стена»4.8.0 → 4.9.0fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
Сообщество свободного программного обеспечения BusyBox≤ 1.30.0fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 12fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 9fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 13fstec_bduRU
busybox busybox< 1.30.0nvdUScpe:2.3:a:busybox:busybox:*:*:*:*:*:*:*:*
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 16.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 18.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*

showing 20 of 45

advisories (2)

Vendor and ecosystem advisories describing this.

VDE-2020-038Pepperl+Fuchs: Multiple vulnerabilites in Comtrol IO-Link Master2021-01-04csaf · pepperl_fuchs_psirtDE
Several vulnerabilities exist within firmware versions up to and including v1.5.48.
ICSA-21-054-03Advantech Spectre RT Industrial Routers2021-02-23icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities may allow information disclosure, deletion of files, and remote code execution.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd pepperl_fuchs_psirt NVD CVE.org MITRE

published 2019-01-09modified 2026-09-17

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+11867 more

references (29)

External citations — patches, advisories, analysis.

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