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TI-2021-19308 Aliases CVE-2021-43315GHSA-pc9f-fr4v-3pc2

Memory corruption in upx

Priority HIGH 72CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A heap-based buffer overflows was discovered in upx, during the generic pointer 'p' points to an inaccessible address in func get_le32(). The problem is essentially caused in PackLinuxElf32::elf_lookup() at p_lx_elf.cpp:5349

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00817 57th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—upxupx before 4.0.0-git-c6b9e3c62d15—No fix listedCNA
  • upx Vendor— Affected upx before 4.0.0-git-c6b9e3c62d15 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:upx:upx:*:*:*:*:*:*:*:*before 4.0.0VulnerableUpx
  • cpe:2.3:a:upx:upx:*:*:*:*:*:*:*:* Versions before 4.0.0 Vulnerable ·Upx

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43315
  2. 2026-10-03 Alias added: GHSA-pc9f-fr4v-3pc2

References

Exploit 1

See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences