HOMEVULNERABILITIESCVE-2019-5747
HIGH

CVE-2019-5747

CWE-125Published: January 9, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An issue was discovered in BusyBox through 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP client, server, and/or relay) might allow a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to assurance of a 4-byte length when decoding DHCP_SUBNET. NOTE: this issue exists because of an incomplete fix for CVE-2018-20679.

NVD Source

Technical Analysis

CVE-2019-5747 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
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

Affected Vendors & Products

busybox1 product(s)
busybox
Canonical1 product(s)
ubuntu linux
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06
PATCHhttps://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06
ADVISORYhttp://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
ADVISORYhttp://seclists.org/fulldisclosure/2019/Sep/7
ADVISORYhttps://bugs.busybox.net/show_bug.cgi?id=11506
ADVISORYhttps://seclists.org/bugtraq/2019/Sep/7
ADVISORYhttps://usn.ubuntu.com/3935-1/
ADVISORYhttp://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
ADVISORYhttp://seclists.org/fulldisclosure/2019/Sep/7
ADVISORYhttps://bugs.busybox.net/show_bug.cgi?id=11506
ADVISORYhttps://seclists.org/bugtraq/2019/Sep/7
ADVISORYhttps://usn.ubuntu.com/3935-1/

All References (12)

→
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.htmlExploit · Third Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2019/Sep/7Mailing List · Third Party Advisory
→
https://bugs.busybox.net/show_bug.cgi?id=11506Exploit · Issue Tracking · Third Party Advisory
→
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06Patch · Third Party Advisory
→
https://seclists.org/bugtraq/2019/Sep/7Mailing List · Third Party Advisory
→
https://usn.ubuntu.com/3935-1/Third Party Advisory
→
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.htmlExploit · Third Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2019/Sep/7Mailing List · Third Party Advisory
→
https://bugs.busybox.net/show_bug.cgi?id=11506Exploit · Issue Tracking · Third Party Advisory
→
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06Patch · Third Party Advisory
→
https://seclists.org/bugtraq/2019/Sep/7Mailing List · Third Party Advisory
→
https://usn.ubuntu.com/3935-1/Third Party Advisory

Quick Facts

CVE IDCVE-2019-5747
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected2 vendor(s)
PublishedJan 9, 2019

Related CVEs (CWE-125)

CVE-2013-0767
10.0
CVE-2021-41556
10.0
CVE-2021-21777
10.0
CVE-2009-2523
10.0
CVE-2017-14451
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-5747 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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