CVE-2021-43314

HIGH

7.5

CVSS Score

Published: March 24, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 04:10 AM UTC

2 products affected across 2 vendorsUpxUpx

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Severity

HIGH7.5

Exploit prediction

EPSS 0.8%

SSVC

PoC

Description

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:5368

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Upx · Upx

95%

v < 4.0.0

Affected range stops below 4.0.0, so it looks safe — our inference, not a vendor statement

Upx · Fedora Project

60%

v < 4.0.0-git-c6b9e3c62d15

Affected range stops below 4.0.0-git-c6b9e3c62d15, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/upx/upx/issues/380

References (1)

ExploitIssue TrackingPatch

Source: [email protected]

https://github.com/upx/upx/issues/380

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-119CWE-787

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