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    CVE-2018-20679

    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.

    Published:Nov 12, 2018
    Last Modified:Jun 9, 2025
    EPS:Jan 9, 2019
    EPSS Score:0.11309
    CVSS Score:7.5

    Affected Products

    Vendor
    Busybox
    Product
    Busybox
    Vendor
    Canonical
    Product
    Ubuntu Linux

    Exploits

    https://bugs.busybox.net/show_bug.cgi?id=11506https://bugs.busybox.net/show_bug.cgi?id=11506

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-38754 (CVSS 5.1) — A heap overflow in the ifsbreakup() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Deni…
    CVE-2026-38752 (CVSS 2.9) — A stack overflow in the evaluate() function (editors/awk.c) of BusyBox commit 371fe9 allows attackers to cause…
    CVE-2025-60876 (CVSS 6.5) — BusyBox wget thru 1.3.7 accepted raw CR (0x0D)/LF (0x0A) and other C0 control bytes in the HTTP request-target…
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    CVE-2025-12220 (CVSS 10) — Busybox 1.31.1 - Multiple Known Vulnerabilities.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1…
    CVE-2024-58251 (CVSS 2.5) — In netstat in BusyBox through 1.37.0, local users can launch of network application with an argv[0] containing…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High