CVE & CISA-KEV Catalog

CVE-2018-20679

HIGHEPSS 94th pctl
7.5
CVSS v3
NVD

Description

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available
busyboxDebian
Fixed in:1:1.30.1-1CVE-2018-20679
Fixed in:1:1.30.1-1CVE-2018-20679
Fixed in:1:1.30.1-1CVE-2018-20679
Fixed in:1:1.30.1-1CVE-2018-20679
busyboxUbuntu
Fixed in:1:1.21.0-1ubuntu1.4USN-3935-1
Fixed in:1:1.22.0-15ubuntu1.4USN-3935-1
Fixed in:1:1.27.2-2ubuntu3.2USN-3935-1
busybox-initramfsUbuntu
Fixed in:1:1.21.0-1ubuntu1.4USN-3935-1
Fixed in:1:1.22.0-15ubuntu1.4USN-3935-1
Fixed in:1:1.27.2-2ubuntu3.2USN-3935-1
busybox-staticUbuntu
Fixed in:1:1.21.0-1ubuntu1.4USN-3935-1
Fixed in:1:1.22.0-15ubuntu1.4USN-3935-1
Fixed in:1:1.27.2-2ubuntu3.2USN-3935-1
udhcpcUbuntu
Fixed in:1:1.21.0-1ubuntu1.4USN-3935-1
Fixed in:1:1.22.0-15ubuntu1.4USN-3935-1
Fixed in:1:1.27.2-2ubuntu3.2USN-3935-1
udhcpdUbuntu
Fixed in:1:1.21.0-1ubuntu1.4USN-3935-1
Fixed in:1:1.22.0-15ubuntu1.4USN-3935-1
Fixed in:1:1.27.2-2ubuntu3.2USN-3935-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

7.69%probability of exploitation in 30 days
94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2014-0160High7.5100%KEVFix
CVE-2025-5777High7.5100%KEV + RansomFix
CVE-2021-4034High7.895%KEVFix
CVE-2023-21769High7.592%-Fix
CVE-2023-49285High8.689%-Fix
CVE-2020-8794Critical9.889%-Fix
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Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-09.