CVE-2021-21376

MEDIUMNVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.4 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 38% 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
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.4Exploit: NoneExposed: 0

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

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

CVSS v3
6.4
EG Score
6.4(medium)
EPSS
70.6%
KEV
Not listed

Published

March 23, 2021

Last Modified

November 21, 2024

References (10)

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
omero-web5.5.dev1 ... 5.8.1 (17 versions)5.9.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 46× 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. 2026-07-21 15:22 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-20 17:04 UTCEPSS rescore
  4. 2026-07-19 14:28 UTCEPSS rescore
  5. 2026-07-19 02:26 UTCEPSS rescore
  6. 2026-07-18 23:29 UTCOSV refresh
  7. 2026-07-18 10:02 UTCEPSS rescore
  8. 2026-07-16 17:00 UTCEPSS rescore
  9. 2026-07-15 16:55 UTCEPSS rescore
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  1. 2026-07-05 02:28 UTCEPSS rescore
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  4. 2026-07-02 16:57 UTCEPSS rescore
  5. 2026-07-01 15:03 UTCEPSS rescore
  6. 2026-07-01 06:48 UTCOSV refresh
  7. 2026-06-30 23:20 UTCEPSS rescore
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  9. 2026-06-28 14:05 UTCEPSS rescore
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  22. 2026-06-21 14:54 UTCEPSS rescore
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  24. 2026-06-21 01:58 UTCEPSS rescore
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  26. 2026-06-19 19:24 UTCEPSS rescore
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  28. 2026-06-18 17:51 UTCEPSS rescore
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  30. 2026-06-17 17:51 UTCEPSS rescore
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  33. 2026-06-14 23:15 UTCEPSS rescore
  34. 2026-06-13 22:58 UTCEPSS rescore
  35. 2026-06-13 11:13 UTCOSV refresh
  36. 2026-06-12 23:10 UTCEPSS rescore
  37. 2026-06-12 23:10 UTCEPSS rescore
  38. 2026-06-11 13:58 UTCEPSS rescore
  39. 2026-06-10 22:16 UTCEPSS rescore
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  41. 2026-06-10 13:20 UTCEPSS rescore
  42. 2026-06-08 14:15 UTCEPSS rescore
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  44. 2026-06-07 15:23 UTCEPSS rescore
  45. 2026-06-07 15:23 UTCEPSS rescore
  46. 2026-06-06 13:46 UTCEPSS rescore
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  49. 2026-06-05 22:45 UTCEPSS rescore
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  59. 2026-05-31 22:29 UTCEPSS rescore
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  63. 2026-05-29 13:42 UTCEPSS rescore
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  66. 2026-05-27 13:39 UTCEPSS rescore
  67. 2026-05-26 19:30 UTCEG score recompute
  68. 2026-05-26 13:42 UTCEPSS rescore
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  70. 2026-05-26 07:17 UTCEPSS rescore
  71. 2026-05-26 07:17 UTCEPSS rescore
  72. 2026-05-24 16:49 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-21376?
CVE-2021-21376 is a medium vulnerability published on March 23, 2021. OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information…
When was CVE-2021-21376 disclosed?
CVE-2021-21376 was first published in the National Vulnerability Database on March 23, 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-2021-21376 actively exploited?
CVE-2021-21376 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-21376?
CVE-2021-21376 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2021-21376?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21376, 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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