HOMEVULNERABILITIESCVE-2018-18584
MEDIUM

CVE-2018-18584

CWE-787Published: October 23, 2018· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.

NVD Source

Technical Analysis

CVE-2018-18584 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

cabextract_project1 product(s)
cabextract
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
libmspack_project1 product(s)
libmspack
Red Hat1 product(s)
enterprise linux
starwindsoftware1 product(s)
starwind virtual san
SUSE1 product(s)
linux enterprise server
Source: NVD CPE · 17 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://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
PATCHhttps://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2049
ADVISORYhttps://bugs.debian.org/911640
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/10/msg00017.html
ADVISORYhttps://security.gentoo.org/glsa/201903-20
ADVISORYhttps://usn.ubuntu.com/3814-1/
ADVISORYhttps://usn.ubuntu.com/3814-2/
ADVISORYhttps://usn.ubuntu.com/3814-3/
ADVISORYhttps://www.cabextract.org.uk/#changes
ADVISORYhttps://www.openwall.com/lists/oss-security/2018/10/22/1
ADVISORYhttps://www.starwindsoftware.com/security/sw-20181213-0001/
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2049
ADVISORYhttps://bugs.debian.org/911640
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/10/msg00017.html
ADVISORYhttps://security.gentoo.org/glsa/201903-20
ADVISORYhttps://usn.ubuntu.com/3814-1/
ADVISORYhttps://usn.ubuntu.com/3814-2/
ADVISORYhttps://usn.ubuntu.com/3814-3/
ADVISORYhttps://www.cabextract.org.uk/#changes
ADVISORYhttps://www.openwall.com/lists/oss-security/2018/10/22/1
ADVISORYhttps://www.starwindsoftware.com/security/sw-20181213-0001/

All References (22)

→
https://access.redhat.com/errata/RHSA-2019:2049Third Party Advisory
→
https://bugs.debian.org/911640Mailing List · Third Party Advisory
→
https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2018/10/msg00017.htmlMailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/201903-20Third Party Advisory
→
https://usn.ubuntu.com/3814-1/Third Party Advisory
→
https://usn.ubuntu.com/3814-2/Third Party Advisory
→
https://usn.ubuntu.com/3814-3/Third Party Advisory
→
https://www.cabextract.org.uk/#changesProduct · Vendor Advisory
→
https://www.openwall.com/lists/oss-security/2018/10/22/1Mailing List · Third Party Advisory
→
https://www.starwindsoftware.com/security/sw-20181213-0001/Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:2049Third Party Advisory
→
https://bugs.debian.org/911640Mailing List · Third Party Advisory
→
https://github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2018/10/msg00017.htmlMailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2018-18584
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected7 vendor(s)
PublishedOct 23, 2018

Related CVEs (CWE-787)

CVE-2016-9343
10.0
CVE-2015-5098
10.0
CVE-2004-0978
10.0
CVE-2015-5105
10.0
CVE-2015-5096
10.0
CVE-2018-6692
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-18584 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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