CVE-2020-27787

MEDIUMNVD 5.55.5—

5.5

A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 15.4%
KEV: Not listed

Published

August 18, 2022

Last Modified

April 11, 2025

References (4)

secalert@redhathttps://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d
secalert@redhathttps://github.com/upx/upx/issues/333
af854a3a-2127-422b-91ae-364da2661108https://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d
af854a3a-2127-422b-91ae-364da2661108https://github.com/upx/upx/issues/333

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-119Buffer Operations Within Bounds (Buffer Overflow)

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-27787?

CVE-2020-27787 is a medium vulnerability published on August 18, 2022. A Segmentaation fault was found in UPX in invertptdynamic() function in plxelf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

When was CVE-2020-27787 disclosed?

CVE-2020-27787 was first published in the National Vulnerability Database on August 18, 2022, with the most recent update on April 11, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-27787 actively exploited?

CVE-2020-27787 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-27787?

CVE-2020-27787 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2020-27787?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-27787, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2020-27787

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-27787?

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Published

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References (4)

Frequently asked(5)

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