HOMEVULNERABILITIESCVE-2023-23456
MEDIUM

CVE-2023-23456

CWE-787Published: January 12, 2023· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

A heap-based buffer overflow issue was discovered in UPX in PackTmt::pack() in p_tmt.cpp file. The flow allows an attacker to cause a denial of service (abort) via a crafted file.

NVD Source

Technical Analysis

CVE-2023-23456 requires local access, meaning attackers must already have a foothold on the target system.

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 5.5.

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

Affected Vendors & Products

Fedora1 product(s)
fedora
upx1 product(s)
upx
Source: NVD CPE · 3 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/upx/upx/commit/510505a85cbe45e51fbd470f1aa8b02157c429d4
PATCHhttps://github.com/upx/upx/commit/510505a85cbe45e51fbd470f1aa8b02157c429d4
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2160381
ADVISORYhttps://github.com/upx/upx/issues/632
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=2160381
ADVISORYhttps://github.com/upx/upx/issues/632

All References (11)

→
https://bugzilla.redhat.com/show_bug.cgi?id=2160381Issue Tracking · Third Party Advisory
→
https://github.com/upx/upx/commit/510505a85cbe45e51fbd470f1aa8b02157c429d4Patch · Third Party Advisory
→
https://github.com/upx/upx/issues/632Exploit · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EL3BVKIGG3SH6I3KPOYQAWCBD4UMPOPI/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGEP3FBNRZXGLIA2B2ICMB32JVMPREFZ/
→
https://bugzilla.redhat.com/show_bug.cgi?id=2160381Issue Tracking · Third Party Advisory
→
https://github.com/upx/upx/commit/510505a85cbe45e51fbd470f1aa8b02157c429d4Patch · Third Party Advisory
→
https://github.com/upx/upx/issues/632Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2024/12/msg00013.html
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EL3BVKIGG3SH6I3KPOYQAWCBD4UMPOPI/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGEP3FBNRZXGLIA2B2ICMB32JVMPREFZ/

Quick Facts

CVE IDCVE-2023-23456
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected2 vendor(s)
PublishedJan 12, 2023

Related CVEs (CWE-787)

CVE-2004-0574
10.0
CVE-2018-10718
10.0
CVE-2018-3991
10.0
CVE-2019-6235
10.0
CVE-2015-0235
10.0
CVE-2009-2466
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-23456 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. CVE data is provided under the NVD usage policy.
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