CVE-2021-40875

HIGHNVD 7.58.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.0 because EPSS predicts 48% probability of exploitation within the next 30 days (top 1.3% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 48%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

Improper Access Control in Gurock TestRail versions < 7.2.0.3014 resulted in sensitive information exposure. A threat actor can access the /files.md5 file on the client side of a Gurock TestRail application, disclosing a full list of application files and the corresponding file paths. The corresponding file paths can be tested, and in some cases, result in the disclosure of hardcoded credentials, API keys, or other sensitive data.

CVSS v3
7.5
EG Score
8.0(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity80% × 45%
Exploitation48% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
48%
EPSS %ILE
99%
KEV
Not listed

Published

September 22, 2021

Last Modified

November 21, 2024

References (8)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 4× 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 112 total refreshes for this CVE.

  1. 2026-09-06 13:45 UTCEPSS rescore
  2. 2026-09-05 15:25 UTCEPSS rescore
  3. 2026-09-04 05:03 UTCEPSS rescore
  4. 2026-09-02 14:09 UTCEPSS rescore
  5. 2026-09-01 13:50 UTCEPSS rescore
  6. 2026-09-01 03:33 UTCEPSS rescore
  7. 2026-08-30 19:14 UTCEPSS rescore
  8. 2026-08-30 19:14 UTCEPSS rescore
  9. 2026-08-30 01:19 UTCEPSS rescore
  10. 2026-08-28 21:37 UTCEPSS rescore
  11. 2026-08-26 14:43 UTCEPSS rescore
  12. 2026-08-25 13:46 UTCEPSS rescore
  13. 2026-08-24 14:13 UTCEPSS rescore
  14. 2026-08-21 23:46 UTCEPSS rescore
  15. 2026-08-20 22:52 UTCEPSS rescore
  16. 2026-08-20 22:52 UTCEPSS rescore
  17. 2026-08-19 17:01 UTCEPSS rescore
  18. 2026-08-18 13:45 UTCEPSS rescore
  19. 2026-08-17 13:44 UTCEPSS rescore
  20. 2026-08-16 14:53 UTCEPSS rescore
  21. 2026-08-16 02:11 UTCEPSS rescore
  22. 2026-08-15 01:27 UTCEPSS rescore
  23. 2026-08-13 21:57 UTCEPSS rescore
  24. 2026-08-12 13:48 UTCEPSS rescore
  25. 2026-08-11 13:38 UTCEPSS rescore
Show 75 more
  1. 2026-08-09 13:44 UTCEPSS rescore
  2. 2026-08-07 16:24 UTCEPSS rescore
  3. 2026-08-06 13:44 UTCEPSS rescore
  4. 2026-08-04 10:34 UTCEPSS rescore
  5. 2026-08-01 04:13 UTCEPSS rescore
  6. 2026-07-30 16:25 UTCEPSS rescore
  7. 2026-07-30 01:28 UTCEPSS rescore
  8. 2026-07-28 15:33 UTCEPSS rescore
  9. 2026-07-26 14:52 UTCEPSS rescore
  10. 2026-07-26 14:52 UTCEPSS rescore
  11. 2026-07-25 14:15 UTCEPSS rescore
  12. 2026-07-24 14:15 UTCEPSS rescore
  13. 2026-07-23 14:16 UTCEPSS rescore
  14. 2026-07-23 02:04 UTCEG score recompute▲ 0.50
  15. 2026-07-22 22:50 UTCEG score recompute
  16. 2026-07-22 14:06 UTCEPSS rescore
  17. 2026-07-21 15:22 UTCEPSS rescore
  18. 2026-07-21 15:22 UTCEPSS rescore
  19. 2026-07-20 17:05 UTCEPSS rescore
  20. 2026-07-19 02:27 UTCEPSS rescore
  21. 2026-07-18 10:02 UTCEPSS rescore
  22. 2026-07-18 10:02 UTCEPSS rescore
  23. 2026-07-16 17:00 UTCEPSS rescore
  24. 2026-07-16 17:00 UTCEPSS rescore
  25. 2026-07-15 16:55 UTCEPSS rescore
  26. 2026-07-15 16:55 UTCEPSS rescore
  27. 2026-07-13 22:27 UTCEPSS rescore
  28. 2026-07-13 22:27 UTCEPSS rescore
  29. 2026-07-13 06:11 UTCEPSS rescore
  30. 2026-07-13 06:11 UTCEPSS rescore
  31. 2026-07-12 05:44 UTCEPSS rescore
  32. 2026-07-11 08:25 UTCEPSS rescore
  33. 2026-07-11 08:25 UTCEPSS rescore
  34. 2026-07-09 19:07 UTCEPSS rescore
  35. 2026-07-08 15:12 UTCEPSS rescore
  36. 2026-07-07 13:43 UTCEPSS rescore
  37. 2026-07-05 02:28 UTCEPSS rescore
  38. 2026-07-05 02:28 UTCEPSS rescore
  39. 2026-07-02 16:57 UTCEPSS rescore
  40. 2026-07-01 15:04 UTCEPSS rescore
  41. 2026-06-30 23:20 UTCEPSS rescore
  42. 2026-06-30 23:20 UTCEPSS rescore
  43. 2026-06-29 14:04 UTCEPSS rescore
  44. 2026-06-28 04:54 UTCEPSS rescore
  45. 2026-06-28 04:54 UTCEPSS rescore
  46. 2026-06-27 03:06 UTCEPSS rescore
  47. 2026-06-27 03:06 UTCEPSS rescore
  48. 2026-06-25 13:48 UTCEPSS rescore
  49. 2026-06-25 13:48 UTCEPSS rescore
  50. 2026-06-23 21:31 UTCEPSS rescore
  51. 2026-06-23 21:31 UTCEPSS rescore
  52. 2026-06-22 14:24 UTCEPSS rescore
  53. 2026-06-21 14:55 UTCEPSS rescore
  54. 2026-06-21 01:58 UTCEPSS rescore
  55. 2026-06-21 01:58 UTCEPSS rescore
  56. 2026-06-19 19:24 UTCEPSS rescore
  57. 2026-06-19 19:24 UTCEPSS rescore
  58. 2026-06-18 17:51 UTCEPSS rescore
  59. 2026-06-18 17:51 UTCEPSS rescore
  60. 2026-06-17 17:51 UTCEPSS rescore
  61. 2026-06-17 17:51 UTCEPSS rescore
  62. 2026-06-17 17:51 UTCEPSS rescore
  63. 2026-06-16 17:51 UTCEPSS rescore
  64. 2026-06-16 17:51 UTCEPSS rescore
  65. 2026-06-15 17:46 UTCEPSS rescore
  66. 2026-06-14 23:15 UTCEPSS rescore
  67. 2026-06-14 23:15 UTCEPSS rescore
  68. 2026-06-12 23:10 UTCEPSS rescore
  69. 2026-06-10 22:16 UTCEPSS rescore
  70. 2026-06-10 22:16 UTCEPSS rescore
  71. 2026-06-08 14:15 UTCEPSS rescore
  72. 2026-06-08 14:15 UTCEPSS rescore
  73. 2026-06-07 15:23 UTCEPSS rescore
  74. 2026-06-07 15:23 UTCEPSS rescore
  75. 2026-06-06 13:46 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCLul/TestRail-files.md5-IAC-scanner
    First seen Feb 24, 2022

    Python scanner for TestRail servers vulnerable to CVE-2021-40875

    Open source ↗
  • Exploit-DBEDB-50320
    First seen Sep 23, 2021

    Gurock Testrail 7.2.0.3014 - 'files.md5' Improper Access Control

    Open source ↗
  • GitHub PoCSakuraSamuraii/derailed
    First seen Sep 13, 2021

    CVE-2021-40875: Tools to Inspect Gurock Testrail Servers for Vulnerabilities related to CVE-2021-40875.

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-40875.yaml
    First seen Jan 1, 2021

    Gurock TestRail Application files.md5 Exposure

    Open source ↗

Frequently asked(5)

What is CVE-2021-40875?
CVE-2021-40875 is a high vulnerability published on September 22, 2021. Improper Access Control in Gurock TestRail versions < 7.2.0.3014 resulted in sensitive information exposure. A threat actor can access the /files.md5 file on the client side of a Gurock TestRail application, disclosing a full list of application files and the corresponding file paths. The…
When was CVE-2021-40875 disclosed?
CVE-2021-40875 was first published in the National Vulnerability Database on September 22, 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-2021-40875 actively exploited?
CVE-2021-40875 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48% probability of exploitation in the next 30 days, which ranks it in the top 1.2% of all scored CVEs.
What is the CVSS score of CVE-2021-40875?
CVE-2021-40875 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.0.
How do I remediate CVE-2021-40875?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40875, 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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