CVE-2021-21983

HIGHNVD 6.58.3▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.3 because EPSS predicts 69% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs). NVD baseline CVSS 6.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Exploited in the wild
8.3EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 69%
  • Public exploit code is available (ssvc active, Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 69%CVSS: 6.5Exploit: ssvc active · Metasploit · epss top5pct · epss high · public exploitExposed services: Not assessed

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

Arbitrary file write vulnerability in vRealize Operations Manager API (CVE-2021-21983) prior to 8.4 may allow an authenticated malicious actor with network access to the vRealize Operations Manager API can write files to arbitrary locations on the underlying photon operating system.

CVSS v3
6.5
EG Score
8.3HIGHhigh confidence
EG Risk
88
EG Risk 88/100CISA 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
Severity83% × 45%
Exploitation90% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low mission impact and as soon as possible at medium or high, and watch the vendor's advisory for the fix.
EPSS PROB
69%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCAttend at low mission impact; Act at medium or high.

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

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

March 31, 2021

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
No fix on record yet.
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/162349/VMware-vRealize-Operations-Manager-Server-Side-Request-Forgery-Code-Execution.html
generic

Support Content Notification - Support Portal - Broadcom support portal

https://www.vmware.com/security/advisories/VMSA-2021-0004.html

Vendor Advisories for CVE-2021-21983(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 8× in last 7d / 25× 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 123 total refreshes for this CVE.

  1. 2026-10-06 15:13 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 15:30 UTCEG score recompute
  8. 2026-09-30 15:00 UTCEPSS rescore
  9. 2026-09-26 15:54 UTCEPSS rescore
  10. 2026-09-26 15:54 UTCEPSS rescore
  11. 2026-09-26 00:21 UTCEPSS rescore
  12. 2026-09-24 14:00 UTCEPSS rescore
  13. 2026-09-24 14:00 UTCEPSS rescore
  14. 2026-09-22 14:44 UTCEPSS rescore
  15. 2026-09-21 20:28 UTCEPSS rescore
  16. 2026-09-19 15:37 UTCEPSS rescore
  17. 2026-09-18 19:23 UTCEPSS rescore
  18. 2026-09-17 19:23 UTCEPSS rescore
  19. 2026-09-16 14:05 UTCEPSS rescore
  20. 2026-09-16 14:04 UTCEPSS rescore
  21. 2026-09-15 03:06 UTCEPSS rescore
  22. 2026-09-13 16:43 UTCEPSS rescore
  23. 2026-09-12 14:57 UTCEPSS rescore
  24. 2026-09-10 09:29 UTCEPSS rescore
  25. 2026-09-08 21:56 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-06 13:44 UTCEPSS rescore
  3. 2026-09-05 15:25 UTCEPSS rescore
  4. 2026-09-04 05:03 UTCEPSS rescore
  5. 2026-09-02 14:08 UTCEPSS rescore
  6. 2026-09-01 13:50 UTCEPSS rescore
  7. 2026-08-30 19:14 UTCEPSS rescore
  8. 2026-08-28 21:37 UTCEPSS rescore
  9. 2026-08-27 14:22 UTCEPSS rescore
  10. 2026-08-26 14:42 UTCEPSS rescore
  11. 2026-08-21 23:46 UTCEPSS rescore
  12. 2026-08-20 22:52 UTCEPSS rescore
  13. 2026-08-19 17:01 UTCEPSS rescore
  14. 2026-08-16 02:11 UTCEPSS rescore
  15. 2026-08-15 01:27 UTCEPSS rescore
  16. 2026-08-13 21:57 UTCEPSS rescore
  17. 2026-08-12 13:47 UTCEPSS rescore
  18. 2026-08-12 05:18 UTCEG score recompute
  19. 2026-08-12 05:18 UTCGHSA enrichment
  20. 2026-08-12 04:28 UTCEG score recompute
  21. 2026-08-12 04:28 UTCGHSA enrichment
  22. 2026-08-11 13:38 UTCEPSS rescore
  23. 2026-08-07 16:23 UTCEPSS rescore
  24. 2026-08-06 13:43 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
  26. 2026-08-02 02:24 UTCEPSS rescore
  27. 2026-07-30 16:25 UTCEPSS rescore
  28. 2026-07-30 01:27 UTCEPSS rescore
  29. 2026-07-30 01:27 UTCEPSS rescore
  30. 2026-07-26 14:52 UTCEPSS rescore
  31. 2026-07-24 14:15 UTCEPSS rescore
  32. 2026-07-23 14:15 UTCEPSS rescore
  33. 2026-07-23 01:57 UTCEG score recompute▲ 1.80
  34. 2026-07-22 22:43 UTCEG score recompute
  35. 2026-07-22 14:05 UTCEPSS rescore
  36. 2026-07-21 15:22 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
  38. 2026-07-20 17:04 UTCEPSS rescore
  39. 2026-07-19 14:28 UTCEPSS rescore
  40. 2026-07-19 02:26 UTCEPSS rescore
  41. 2026-07-16 17:00 UTCEPSS rescore
  42. 2026-07-15 16:55 UTCEPSS rescore
  43. 2026-07-15 16:55 UTCEPSS rescore
  44. 2026-07-13 22:27 UTCEPSS rescore
  45. 2026-07-13 22:27 UTCEPSS rescore
  46. 2026-07-12 05:44 UTCEPSS rescore
  47. 2026-07-12 05:44 UTCEPSS rescore
  48. 2026-07-11 08:25 UTCEPSS rescore
  49. 2026-07-09 19:07 UTCEPSS rescore
  50. 2026-07-08 15:12 UTCEPSS rescore
  51. 2026-07-06 02:21 UTCEPSS rescore
  52. 2026-07-06 02:21 UTCEPSS rescore
  53. 2026-07-05 02:28 UTCEPSS rescore
  54. 2026-07-05 02:28 UTCEPSS rescore
  55. 2026-07-04 06:29 UTCEPSS rescore
  56. 2026-07-04 06:29 UTCEPSS rescore
  57. 2026-07-01 15:03 UTCEPSS rescore
  58. 2026-06-30 23:20 UTCEPSS rescore
  59. 2026-06-30 23:20 UTCEPSS rescore
  60. 2026-06-28 14:05 UTCEPSS rescore
  61. 2026-06-28 04:54 UTCEPSS rescore
  62. 2026-06-28 04:54 UTCEPSS rescore
  63. 2026-06-27 03:06 UTCEPSS rescore
  64. 2026-06-27 03:06 UTCEPSS rescore
  65. 2026-06-25 13:48 UTCEPSS rescore
  66. 2026-06-25 13:48 UTCEPSS rescore
  67. 2026-06-24 14:03 UTCEPSS rescore
  68. 2026-06-24 14:03 UTCEPSS rescore
  69. 2026-06-23 21:31 UTCEPSS rescore
  70. 2026-06-23 21:31 UTCEPSS rescore
  71. 2026-06-19 19:24 UTCEPSS rescore
  72. 2026-06-19 19:24 UTCEPSS rescore
  73. 2026-06-18 17:51 UTCEPSS rescore
  74. 2026-06-18 17:51 UTCEPSS rescore
  75. 2026-06-17 17:51 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/vmware_vrops_mgr_ssrf_rce✓ verified
    First seen Mar 30, 2021

    VMware vRealize Operations (vROps) Manager SSRF RCE

    Open source ↗
  • GitHub PoCmurataydemir/CVE-2021-21983
    First seen Mar 16, 2022

    [CVE-2021-21983] VMware vRealize Operations (vROps) Manager API Arbitrary File Write Leads to Remote Code Execution (RCE)

    Open source ↗

Frequently asked(5)

What is CVE-2021-21983?
CVE-2021-21983 is a high vulnerability published on March 31, 2021. Arbitrary file write vulnerability in vRealize Operations Manager API (CVE-2021-21983) prior to 8.4 may allow an authenticated malicious actor with network access to the vRealize Operations Manager API can write files to arbitrary locations on the underlying photon operating system.
When was CVE-2021-21983 disclosed?
CVE-2021-21983 was first published on March 31, 2021, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21983 actively exploited?
CVE-2021-21983 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as exploited in the wild. FIRST EPSS estimates a 69% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-21983?
CVE-2021-21983 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.3 (HIGH).
How do I remediate CVE-2021-21983?
No fix for CVE-2021-21983 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. The vendor advisories EchelonGraph has for CVE-2021-21983 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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