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CVE Record

CVE-2020-24119: A heap buffer overflow read was discovered in upx 4.0.0, because the check in p_lx_elf.cpp is not perfect.

A heap buffer overflow read was discovered in upx 4.0.0, because the check in p_lx_elf.cpp is not perfect.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2020-24119 is a memory-read flaw in UPX 4.0.0. If UPX processes a specially malformed file, it may read beyond an allocated heap buffer. Business risk is mainly where UPX is used on untrusted files, but the provided sources do not give CVSS, affected CPEs, or confirmed exploitation.

Executive priority

Treat as a targeted dependency hygiene issue, not an emergency, unless UPX handles untrusted files in critical workflows. Prioritize inventory, vendor guidance, and isolation because severity and exploitation evidence are incomplete.

Technical view

The CVE describes a heap buffer overflow read in UPX 4.0.0, tied to an imperfect check in p_lx_elf.cpp. This aligns with CWE-126 out-of-bounds read behavior. Public references include the UPX issue and Fedora package advisories, but the bundle does not provide fixed upstream versions or exploit details.

Likely exposure

Likely exposure is limited to environments running UPX 4.0.0, especially workflows that process untrusted executables or packaged binaries. The CVE record lists no CPEs and the affected section is incomplete, so inventory confirmation is required before scoping impact.

Exploitation context

The source bundle does not show KEV listing or cited evidence of active exploitation. The issue class can support crashes or unintended memory disclosure, but no exploit status, real-world abuse, or weaponized technique is provided in the supplied sources.

Researcher notes

The strongest facts are the UPX 4.0.0 heap over-read description, p_lx_elf.cpp location, Fedora advisories, and CWE-126 mapping. Missing data includes CVSS, CPEs, exact affected distributions, fixed versions, and exploitation evidence.

Mitigation direction

  • Inventory UPX installations and identify any version 4.0.0 usage.
  • Review UPX and Fedora advisories for fixed package guidance.
  • Avoid processing untrusted binaries with UPX until remediation is confirmed.
  • Run UPX only in constrained analysis or build environments.
  • Track vendor advisories because the bundle lacks exact fixed versions.

Validation and detection

  • Check host, container, and build images for installed UPX versions.
  • Identify automated jobs that run UPX against external or untrusted files.
  • Review Fedora advisory applicability for affected Linux packages.
  • Confirm whether controls isolate UPX from sensitive memory or production systems.
  • Document remediation status and remaining untrusted-file exposure.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-24119 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.