CVE-2021-27237

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.8 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 42% 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
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.8Exploit: None knownExposed: 0

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

The admin panel in BlackCat CMS 1.3.6 allows stored XSS (by an admin) via the Display Name field to backend/preferences/ajax_save.php.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity48% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

February 16, 2021

Last Modified

November 21, 2024

References (6)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 134 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-20 08:01 UTCOSV refresh
  3. 2026-08-19 17:01 UTCEPSS rescore
  4. 2026-08-18 13:45 UTCEPSS rescore
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  18. 2026-08-05 03:40 UTCOSV refresh
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  1. 2026-07-30 01:28 UTCEPSS rescore
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  9. 2026-07-23 01:59 UTCEG score recompute
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  11. 2026-07-22 14:06 UTCEPSS rescore
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  19. 2026-07-19 01:29 UTCOSV refresh
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  25. 2026-07-15 01:58 UTCEPSS rescore
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  43. 2026-07-02 16:57 UTCEPSS rescore
  44. 2026-07-01 15:03 UTCEPSS rescore
  45. 2026-07-01 08:18 UTCOSV refresh
  46. 2026-06-30 23:20 UTCEPSS rescore
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  48. 2026-06-28 14:05 UTCEPSS rescore
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  65. 2026-06-19 19:24 UTCEPSS rescore
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  67. 2026-06-18 17:51 UTCEPSS rescore
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  72. 2026-06-14 23:15 UTCEPSS rescore
  73. 2026-06-13 22:58 UTCEPSS rescore
  74. 2026-06-13 22:58 UTCEPSS rescore
  75. 2026-06-13 13:43 UTCOSV refresh

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Frequently asked(5)

What is CVE-2021-27237?
CVE-2021-27237 is a medium vulnerability published on February 16, 2021. The admin panel in BlackCat CMS 1.3.6 allows stored XSS (by an admin) via the Display Name field to backend/preferences/ajax_save.php.
When was CVE-2021-27237 disclosed?
CVE-2021-27237 was first published in the National Vulnerability Database on February 16, 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-2021-27237 actively exploited?
CVE-2021-27237 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 41.2% of all scored CVEs.
What is the CVSS score of CVE-2021-27237?
CVE-2021-27237 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2021-27237?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27237, 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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