CVE-2020-4043

HIGHNVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under NVD CVSS v3. EPSS exploit probability: 2.6%, top 16% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 7.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

phpMussel from versions 1.0.0 and less than 1.6.0 has an unserialization vulnerability in PHP's phar wrapper. Uploading a specially crafted file to an affected version allows arbitrary code execution (discovered, tested, and confirmed by myself), so the risk factor should be regarded as very high. Newer phpMussel versions don't use PHP's phar wrapper, and are therefore unaffected. This has been fixed in version 1.6.0.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
83.7%
KEV
Not listed

Published

June 10, 2020

Last Modified

November 21, 2024

References (10)

Affected Packages

(2 across 1 ecosystem)
Packagist(2)
PackageVulnerable rangeFixed inDependents
maikuolan/phpmusselv1.0.0 ... v1.5.0 (7 versions)1.6.0—
phpmussel/phpmusselv1.0.0 ... v1.5.0 (7 versions)1.6.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 51× 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.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:53 UTCEG score recompute
  3. 2026-07-22 22:40 UTCEG score recompute
  4. 2026-07-22 14:05 UTCEPSS rescore
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  11. 2026-07-19 10:52 UTCOSV refresh
  12. 2026-07-19 02:26 UTCEPSS rescore
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  1. 2026-07-11 08:25 UTCEPSS rescore
  2. 2026-07-09 19:07 UTCEPSS rescore
  3. 2026-07-08 15:12 UTCEPSS rescore
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  5. 2026-07-06 16:25 UTCEPSS rescore
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  12. 2026-07-02 16:57 UTCEPSS rescore
  13. 2026-07-01 18:01 UTCOSV refresh
  14. 2026-07-01 15:03 UTCEPSS rescore
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  27. 2026-06-21 14:54 UTCEPSS rescore
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  37. 2026-06-14 23:15 UTCEPSS rescore
  38. 2026-06-14 01:13 UTCOSV refresh
  39. 2026-06-13 22:58 UTCEPSS rescore
  40. 2026-06-12 23:10 UTCEPSS rescore
  41. 2026-06-11 13:58 UTCEPSS rescore
  42. 2026-06-10 22:16 UTCEPSS rescore
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  44. 2026-06-08 14:15 UTCEPSS rescore
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  66. 2026-05-27 02:38 UTCEG score recompute
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Frequently asked(5)

What is CVE-2020-4043?
CVE-2020-4043 is a high vulnerability published on June 10, 2020. phpMussel from versions 1.0.0 and less than 1.6.0 has an unserialization vulnerability in PHP's phar wrapper. Uploading a specially crafted file to an affected version allows arbitrary code execution (discovered, tested, and confirmed by myself), so the risk factor should be regarded as very high.…
When was CVE-2020-4043 disclosed?
CVE-2020-4043 was first published in the National Vulnerability Database on June 10, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-4043 actively exploited?
CVE-2020-4043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-4043?
CVE-2020-4043 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2020-4043?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-4043, 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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