CVE-2021-33256

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 79%
CISA-KEV: Not listedEPSS: 79%CVSS: 8.8Exploit: NoneExposed: 0

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

A CSV injection vulnerability on the login panel of ManageEngine ADSelfService Plus Version: 6.1 Build No: 6101 can be exploited by an unauthenticated user. The j_username parameter seems to be vulnerable and a reverse shell could be obtained if a privileged user exports "User Attempts Audit Report" as CSV file. Note: The vendor disputes this vulnerability, claiming "This is not a valid vulnerability in our ADSSP product. We don't see this as a security issue at our side.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
—
EPSS
99.6%
KEV
Not listed

Published

August 9, 2021

Last Modified

November 21, 2024

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 18× 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. 2026-07-22 22:48 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-19 02:27 UTCEPSS rescore
  7. 2026-07-15 16:55 UTCEPSS rescore
  8. 2026-07-13 22:27 UTCEPSS rescore
  9. 2026-07-11 08:25 UTCEPSS rescore
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  11. 2026-07-07 13:43 UTCEPSS rescore
  12. 2026-07-04 06:29 UTCEPSS rescore
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  14. 2026-07-01 15:04 UTCEPSS rescore
  15. 2026-06-25 13:48 UTCEPSS rescore
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  17. 2026-06-23 21:31 UTCEPSS rescore
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  19. 2026-06-21 14:55 UTCEPSS rescore
  20. 2026-06-17 17:51 UTCEPSS rescore
  21. 2026-06-15 17:46 UTCEPSS rescore
  22. 2026-06-14 23:15 UTCEPSS rescore
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  25. 2026-06-12 23:10 UTCEPSS rescore
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  1. 2026-06-12 23:10 UTCEPSS rescore
  2. 2026-06-11 13:58 UTCEPSS rescore
  3. 2026-06-10 22:16 UTCEPSS rescore
  4. 2026-06-10 13:20 UTCEPSS rescore
  5. 2026-06-07 15:23 UTCEPSS rescore
  6. 2026-06-07 15:23 UTCEPSS rescore
  7. 2026-06-06 13:46 UTCEPSS rescore
  8. 2026-06-06 13:46 UTCEPSS rescore
  9. 2026-06-06 13:46 UTCEPSS rescore
  10. 2026-06-05 22:45 UTCEPSS rescore
  11. 2026-06-05 06:09 UTCEPSS rescore
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  13. 2026-06-04 13:10 UTCEPSS rescore
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  15. 2026-06-02 20:11 UTCEPSS rescore
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  17. 2026-06-01 13:50 UTCEPSS rescore
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  19. 2026-05-31 22:29 UTCEPSS rescore
  20. 2026-05-31 22:29 UTCEPSS rescore
  21. 2026-05-31 00:15 UTCEPSS rescore
  22. 2026-05-31 00:15 UTCEPSS rescore
  23. 2026-05-29 13:42 UTCEPSS rescore
  24. 2026-05-29 13:42 UTCEPSS rescore
  25. 2026-05-28 13:43 UTCEPSS rescore
  26. 2026-05-28 13:43 UTCEPSS rescore
  27. 2026-05-27 13:39 UTCEPSS rescore
  28. 2026-05-27 13:39 UTCEPSS rescore
  29. 2026-05-27 13:39 UTCEPSS rescore
  30. 2026-05-26 13:42 UTCEPSS rescore
  31. 2026-05-26 12:26 UTCEG score recompute
  32. 2026-05-26 12:26 UTCGHSA enrichment
  33. 2026-05-26 07:17 UTCEPSS rescore
  34. 2026-05-26 07:17 UTCEPSS rescore
  35. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-33256?
CVE-2021-33256 is a high vulnerability published on August 9, 2021. A CSV injection vulnerability on the login panel of ManageEngine ADSelfService Plus Version: 6.1 Build No: 6101 can be exploited by an unauthenticated user. The j_username parameter seems to be vulnerable and a reverse shell could be obtained if a privileged user exports "User Attempts Audit…
When was CVE-2021-33256 disclosed?
CVE-2021-33256 was first published in the National Vulnerability Database on August 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-2021-33256 actively exploited?
CVE-2021-33256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-33256?
CVE-2021-33256 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-33256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33256, 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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