CVE-2021-28134

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 5.2%, top 8% 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 9.8Exploit: None knownExposed: 0

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

Clipper before 1.0.5 allows remote command execution. A remote attacker may send a crafted IPC message to the exposed vulnerable ipcRenderer IPC interface, which invokes the dangerous openExternal API.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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
Severity98% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

March 11, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 14, 2026
Patch available. Sources: github_pr, github_release.
github_release Patch Available

Minor security patch release

Patch available: AkashRajpurohit/clipper v1.0.5

https://github.com/AkashRajpurohit/clipper/releases/tag/v1.0.5
github_pr Patch Available

fix: check for allowed urls to be opened using shell.openExternal 🩹

Patch available: AkashRajpurohit/clipper v1.0.5 (PR #14 merged 2021-03-10)

https://github.com/AkashRajpurohit/clipper/pull/14/commits/28f1492a12234cf1e6af85c78bf22ee2f5090d19
github_pr Patch Available

fix: check for allowed urls to be opened using shell.openExternal 🩹

Patch available: AkashRajpurohit/clipper v1.0.5 (PR #14 merged 2021-03-10)

https://github.com/AkashRajpurohit/clipper/pull/14
generic

Potential Command Execution vulnerabilities introduced by preload.js · Issue #13 · AkashRajpurohit/clipper · GitHub

https://github.com/AkashRajpurohit/clipper/issues/13

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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.

Showing the most recent 100 of 132 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:01 UTCEPSS rescore
  3. 2026-08-18 13:45 UTCEPSS rescore
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  8. 2026-08-15 06:07 UTCOSV refresh
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  23. 2026-07-30 18:20 UTCOSV refresh
  24. 2026-07-30 16:25 UTCEPSS rescore
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  1. 2026-07-30 01:28 UTCEPSS rescore
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  8. 2026-07-23 14:16 UTCEPSS rescore
  9. 2026-07-23 01:59 UTCEG score recompute
  10. 2026-07-22 22:46 UTCEG score recompute
  11. 2026-07-22 14:06 UTCEPSS rescore
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  24. 2026-07-15 01:58 UTCEPSS rescore
  25. 2026-07-13 22:27 UTCEPSS rescore
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  27. 2026-07-13 03:08 UTCOSV refresh
  28. 2026-07-12 05:44 UTCEPSS rescore
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  30. 2026-07-11 08:25 UTCEPSS rescore
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  32. 2026-07-09 19:07 UTCEPSS rescore
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  42. 2026-07-02 16:57 UTCEPSS rescore
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  44. 2026-06-30 23:20 UTCEPSS rescore
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  46. 2026-06-28 14:05 UTCEPSS rescore
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  55. 2026-06-24 12:48 UTCOSV refresh
  56. 2026-06-23 21:31 UTCEPSS rescore
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  71. 2026-06-14 23:15 UTCEPSS rescore
  72. 2026-06-13 22:58 UTCEPSS rescore
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  74. 2026-06-12 23:10 UTCEPSS rescore
  75. 2026-06-11 13:58 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-28134?
CVE-2021-28134 is a critical vulnerability published on March 11, 2021. Clipper before 1.0.5 allows remote command execution. A remote attacker may send a crafted IPC message to the exposed vulnerable ipcRenderer IPC interface, which invokes the dangerous openExternal API.
When was CVE-2021-28134 disclosed?
CVE-2021-28134 was first published in the National Vulnerability Database on March 11, 2021, 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-2021-28134 actively exploited?
CVE-2021-28134 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.2% of all scored CVEs.
What is the CVSS score of CVE-2021-28134?
CVE-2021-28134 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-28134?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28134, 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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