CVE-2021-30480

HIGHNVD 8.58.8▲
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.5; sources differ by 0.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.8%CVSS: 8.5Exploit: None knownExposed services: Not assessed

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

Zoom Chat through 2021-04-09 on Windows and macOS allows certain remote authenticated attackers to execute arbitrary code without user interaction. An attacker must be within the same organization, or an external party who has been accepted as a contact. NOTE: this is specific to the Zoom Chat software, which is different from the chat feature of the Zoom Meetings and Zoom Video Webinars software.

CVSS v3
8.5
EG Score
8.8HIGHmedium confidence
EG Risk
46
EG Risk 46/100CISA SSVC

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
Severity88% × 45%
Exploitation6% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
5.8%
EPSS %ILE
92nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 9, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Sep 2, 2026
⚠️ Active exploitation confirmed. No fix on record yet.
generic

Zoom zero-day discovery makes calls safer, hackers $200,000 richer

https://blog.malwarebytes.com/exploits-and-vulnerabilities/2021/04/zoom-zero-day-discovery-makes-calls-safer-hackers-200000-richer/
generic

ZDI-21-971 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-21-971/
generic

Critical Zoom vulnerability triggers remote code execution without user input - ZDNET

https://www.zdnet.com/article/critical-zoom-vulnerability-triggers-remote-code-execution-without-user-input/
generic🔴 Active Exploitation

$200,000 Awarded for Zero-Click Zoom Exploit at Pwn2Own - SecurityWeek

https://www.securityweek.com/200000-awarded-zero-click-zoom-exploit-pwn2own
generic

TrendAI Zero Day Initiative on X: "Confirmed! The duo of Daan Keuper and Thijs Alkemade from Computest used a 3-bug chain to exploit #Zoom messenger with 0 clicks from the target. They win $200,000 and 20 points towards Master of Pwn. #Pwn2Own" / X

https://twitter.com/thezdi/status/1379859851061395459
generic

TrendAI Zero Day Initiative on X: "We're still confirming the details of the #Zoom exploit with Daan and Thijs, but here's a better gif of the bug in action. #Pwn2Own #PopCalc" / X

https://twitter.com/thezdi/status/1379855435730149378

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 171 total refreshes for this CVE.

  1. 2026-10-06 15:14 UTCEPSS rescore
  2. 2026-10-05 17:40 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-10-03 14:22 UTCEPSS rescore
  5. 2026-10-02 16:22 UTCEPSS rescore
  6. 2026-10-01 19:46 UTCEPSS rescore
  7. 2026-09-30 15:35 UTCEG score recompute
  8. 2026-09-30 15:00 UTCEPSS rescore
  9. 2026-09-29 15:15 UTCEPSS rescore
  10. 2026-09-28 13:47 UTCEPSS rescore
  11. 2026-09-27 13:41 UTCEPSS rescore
  12. 2026-09-26 15:54 UTCEPSS rescore
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  17. 2026-09-21 20:28 UTCEPSS rescore
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  25. 2026-09-12 14:57 UTCEPSS rescore
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  1. 2026-09-11 14:49 UTCEPSS rescore
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  3. 2026-09-08 21:56 UTCEPSS rescore
  4. 2026-09-06 13:44 UTCEPSS rescore
  5. 2026-09-05 15:25 UTCEPSS rescore
  6. 2026-09-04 13:57 UTCEPSS rescore
  7. 2026-09-04 05:03 UTCEPSS rescore
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  9. 2026-09-02 14:08 UTCEPSS rescore
  10. 2026-09-01 13:50 UTCEPSS rescore
  11. 2026-09-01 03:32 UTCEPSS rescore
  12. 2026-08-30 19:14 UTCEPSS rescore
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  14. 2026-08-28 21:37 UTCEPSS rescore
  15. 2026-08-27 14:22 UTCEPSS rescore
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  18. 2026-08-24 14:12 UTCEPSS rescore
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  20. 2026-08-21 23:46 UTCEPSS rescore
  21. 2026-08-20 22:52 UTCEPSS rescore
  22. 2026-08-19 17:01 UTCEPSS rescore
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  25. 2026-08-16 14:53 UTCEPSS rescore
  26. 2026-08-16 02:11 UTCEPSS rescore
  27. 2026-08-16 02:11 UTCEPSS rescore
  28. 2026-08-15 01:27 UTCEPSS rescore
  29. 2026-08-13 21:57 UTCEPSS rescore
  30. 2026-08-12 13:47 UTCEPSS rescore
  31. 2026-08-11 13:38 UTCEPSS rescore
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  35. 2026-08-06 13:43 UTCEPSS rescore
  36. 2026-08-05 19:14 UTCEPSS rescore
  37. 2026-08-04 15:06 UTCEPSS rescore
  38. 2026-08-03 10:33 UTCEPSS rescore
  39. 2026-08-02 02:24 UTCEPSS rescore
  40. 2026-08-01 04:13 UTCEPSS rescore
  41. 2026-07-30 16:25 UTCEPSS rescore
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  43. 2026-07-30 01:28 UTCEPSS rescore
  44. 2026-07-30 01:27 UTCEPSS rescore
  45. 2026-07-28 15:33 UTCEPSS rescore
  46. 2026-07-26 14:52 UTCEPSS rescore
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  48. 2026-07-25 14:15 UTCEPSS rescore
  49. 2026-07-24 14:15 UTCEPSS rescore
  50. 2026-07-23 14:16 UTCEPSS rescore
  51. 2026-07-23 02:00 UTCEG score recompute
  52. 2026-07-22 22:47 UTCEG score recompute
  53. 2026-07-22 14:06 UTCEPSS rescore
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  55. 2026-07-21 15:22 UTCEPSS rescore
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  57. 2026-07-20 17:05 UTCEPSS rescore
  58. 2026-07-19 14:28 UTCEPSS rescore
  59. 2026-07-19 02:27 UTCEPSS rescore
  60. 2026-07-19 02:27 UTCEPSS rescore
  61. 2026-07-18 10:02 UTCEPSS rescore
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  63. 2026-07-16 17:00 UTCEPSS rescore
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  66. 2026-07-15 01:58 UTCEPSS rescore
  67. 2026-07-13 22:27 UTCEPSS rescore
  68. 2026-07-13 22:27 UTCEPSS rescore
  69. 2026-07-12 05:44 UTCEPSS rescore
  70. 2026-07-12 05:44 UTCEPSS rescore
  71. 2026-07-11 08:25 UTCEPSS rescore
  72. 2026-07-11 08:25 UTCEPSS rescore
  73. 2026-07-09 19:07 UTCEPSS rescore
  74. 2026-07-08 15:12 UTCEPSS rescore
  75. 2026-07-07 13:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-30480?
CVE-2021-30480 is a high vulnerability published on April 9, 2021. Zoom Chat through 2021-04-09 on Windows and macOS allows certain remote authenticated attackers to execute arbitrary code without user interaction. An attacker must be within the same organization, or an external party who has been accepted as a contact. NOTE: this is specific to the Zoom Chat…
When was CVE-2021-30480 disclosed?
CVE-2021-30480 was first published on April 9, 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-2021-30480 actively exploited?
CVE-2021-30480 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.8% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-30480?
CVE-2021-30480 has a CVSS v3 base score of 8.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.8 (HIGH).
How do I remediate CVE-2021-30480?
No fix for CVE-2021-30480 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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