busybox: Out of bounds read in udhcp components resulting in information disclosure
Published Jan 9, 2019
7.5
HIGHCVSS 3.1
EPSS 7.69%
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.
Affected products
No data.
Configuration 2
- 14.04
- 16.04
- 18.04
- 18.10
No data.
Red Hat Enterprise Linux 5
busybox
Not affected
Red Hat Enterprise Linux 6
busybox
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | busybox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | busybox | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of busybox as shipped with Red Hat Enterprise Linux 5 and 6.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jun 9, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (26 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 7.69% (0.07694) | 94.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.90% (0.07905) | 93.95th | v5 (v2026.06.15) |
| May 30, 2026 | 13.00% (0.13004) | 94.20th | v4 (v2025.03.14) |
| Mar 11, 2026 | 11.96% (0.11964) | 93.64th | v4 (v2025.03.14) |
| Nov 21, 2025 | 8.84% (0.08842) | 92.20th | v4 (v2025.03.14) |
| Nov 18, 2025 | 2.22% (0.02224) | 83.14th | v4 (v2025.03.14) |
| Oct 22, 2025 | 9.00% (0.08996) | 92.22th | v4 (v2025.03.14) |
| Oct 1, 2025 | 12.39% (0.12393) | 93.67th | v4 (v2025.03.14) |
| Jun 29, 2025 | 11.31% (0.11309) | 93.19th | v4 (v2025.03.14) |
| Jun 4, 2025 | 4.42% (0.04422) | 88.46th | v4 (v2025.03.14) |
| May 12, 2025 | 9.87% (0.09870) | 92.55th | v4 (v2025.03.14) |
| Mar 30, 2025 | 7.09% (0.07094) | 90.65th | v4 (v2025.03.14) |
| Mar 29, 2025 | 27.09% (0.27086) | 94.20th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.09% (0.07094) | 90.86th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.57% (0.00568) | 78.57th | v3 (v2023.03.01) |
| Apr 4, 2024 | 0.56% (0.00564) | 77.35th | v3 (v2023.03.01) |
| Jan 3, 2024 | 0.56% (0.00564) | 75.34th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.58% (0.00584) | 74.81th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.08% (0.02080) | 50.39th | v1 |
| Jan 6, 2022 | 2.08% (0.02080) | 49.89th | v1 |
| Sep 1, 2021 | 2.08% (0.02080) | 77.32th | v1 |
| Apr 14, 2021 | 2.08% (0.02080) | 0.00th | v1 |
References (11)
- http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html x_refsource_MISC
- http://seclists.org/fulldisclosure/2019/Sep/7 mailing-listx_refsource_FULLDISC
- https://access.redhat.com/security/cve/CVE-2018-20679 Vendor Advisory
- https://bugs.busybox.net/show_bug.cgi?id=11506 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1666667 Issue Tracking
- https://busybox.net/news.html x_refsource_MISCRelease NotesThird Party Advisory
- https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c x_refsource_MISCPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-20679
- https://seclists.org/bugtraq/2019/Sep/7 mailing-listx_refsource_BUGTRAQ
- https://usn.ubuntu.com/3935-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-20679
| Link | Providers | Tags |
|---|---|---|
| http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html | x_refsource_MISC | |
| http://seclists.org/fulldisclosure/2019/Sep/7 | mailing-listx_refsource_FULLDISC | |
| https://access.redhat.com/security/cve/CVE-2018-20679 | Vendor Advisory | |
| https://bugs.busybox.net/show_bug.cgi?id=11506 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1666667 | Issue Tracking | |
| https://busybox.net/news.html | x_refsource_MISCRelease NotesThird Party Advisory | |
| https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c | x_refsource_MISCPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-20679 | ||
| https://seclists.org/bugtraq/2019/Sep/7 | mailing-listx_refsource_BUGTRAQ | |
| https://usn.ubuntu.com/3935-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-20679 |
Change history (0)
No recorded changes yet.