CVE-2021-35215

HIGHNVD 8.99.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 70% probability of exploitation within the next 30 days (top 0.7% of all CVEs). NVD baseline CVSS 8.9 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Elevated
8.9
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 70%
CISA-KEV: Not listedEPSS: 70%CVSS: 8.9Exploit: NoneExposed: 0

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

Insecure deserialization leading to Remote Code Execution was detected in the Orion Platform version 2020.2.5. Authentication is required to exploit this vulnerability.

CVSS v3
8.9
EG Score
9.0(high)
EG Risk
73(Track)
EG Risk 73/100SSVC: 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
Severity90% × 45%
Exploitation70% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
99.3%
KEV
Not listed

Published

September 1, 2021

Last Modified

November 21, 2024

References (8)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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 02:02 UTCEG score recompute▲ 0.10
  2. 2026-07-22 22:49 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-22 14:06 UTCEPSS rescore
  5. 2026-07-20 17:05 UTCEPSS rescore
  6. 2026-07-16 17:00 UTCEPSS rescore
  7. 2026-07-16 17:00 UTCEPSS rescore
  8. 2026-07-15 16:55 UTCEPSS rescore
  9. 2026-07-13 22:27 UTCEPSS rescore
  10. 2026-07-12 05:44 UTCEPSS rescore
  11. 2026-07-12 05:44 UTCEPSS rescore
  12. 2026-07-09 19:07 UTCEPSS rescore
  13. 2026-07-06 16:25 UTCEPSS rescore
  14. 2026-07-04 06:29 UTCEPSS rescore
  15. 2026-07-04 06:29 UTCEPSS rescore
  16. 2026-07-01 15:04 UTCEPSS rescore
  17. 2026-06-30 23:20 UTCEPSS rescore
  18. 2026-06-30 23:20 UTCEPSS rescore
  19. 2026-06-27 03:06 UTCEPSS rescore
  20. 2026-06-25 13:48 UTCEPSS rescore
  21. 2026-06-25 13:48 UTCEPSS rescore
  22. 2026-06-24 14:03 UTCEPSS rescore
  23. 2026-06-24 14:03 UTCEPSS rescore
  24. 2026-06-23 21:31 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 30 more
  1. 2026-06-22 14:24 UTCEPSS rescore
  2. 2026-06-22 14:24 UTCEPSS rescore
  3. 2026-06-18 17:51 UTCEPSS rescore
  4. 2026-06-18 17:51 UTCEPSS rescore
  5. 2026-06-17 17:51 UTCEPSS rescore
  6. 2026-06-16 17:51 UTCEPSS rescore
  7. 2026-06-16 17:51 UTCEPSS rescore
  8. 2026-06-15 17:46 UTCEPSS rescore
  9. 2026-06-12 23:10 UTCEPSS rescore
  10. 2026-06-12 23:10 UTCEPSS rescore
  11. 2026-06-10 22:16 UTCEPSS rescore
  12. 2026-06-08 14:15 UTCEPSS rescore
  13. 2026-06-08 14:15 UTCEPSS rescore
  14. 2026-06-05 22:45 UTCEPSS rescore
  15. 2026-06-05 06:09 UTCEPSS rescore
  16. 2026-06-05 06:09 UTCEPSS rescore
  17. 2026-05-31 00:15 UTCEPSS rescore
  18. 2026-05-31 00:15 UTCEPSS rescore
  19. 2026-05-29 13:42 UTCEPSS rescore
  20. 2026-05-29 13:42 UTCEPSS rescore
  21. 2026-05-27 13:39 UTCEPSS rescore
  22. 2026-05-27 13:39 UTCEPSS rescore
  23. 2026-05-27 13:39 UTCEPSS rescore
  24. 2026-05-26 13:42 UTCEPSS rescore
  25. 2026-05-26 11:12 UTCEG score recompute
  26. 2026-05-26 11:12 UTCGHSA enrichment
  27. 2026-05-26 07:17 UTCEPSS rescore
  28. 2026-05-26 07:17 UTCEPSS rescore
  29. 2026-05-26 07:17 UTCEPSS rescore
  30. 2026-05-24 19:12 UTCOSV refresh

Publicly available exploits

(1 reference)

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

  • GitHub PoCY4er/CVE-2021-35215
    First seen Oct 23, 2021

    SolarWinds Orion Platform ActionPluginBaseView 反序列化RCE

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-35215?
CVE-2021-35215 is a high vulnerability published on September 1, 2021. Insecure deserialization leading to Remote Code Execution was detected in the Orion Platform version 2020.2.5. Authentication is required to exploit this vulnerability.
When was CVE-2021-35215 disclosed?
CVE-2021-35215 was first published in the National Vulnerability Database on September 1, 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-2021-35215 actively exploited?
CVE-2021-35215 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-35215?
CVE-2021-35215 has a CVSS v3 base score of 8.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2021-35215?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35215, 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.

Dependency Blast Radius

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