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ExploitedNot in CISA KEV yetFix available

CVE-2021-40875

Exploitation confirmed. First attested on 2025-08-18 by GCVE · kevintel, GCVE · shadowserver.

  • Published2021-09-22
  • Fixed in7.2.0.3014
  • WeaknessCWE-425

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-09-2215:15CVE publishedNVD
  2. 2021-09-23Exploit-DB entryExploit-DB
  3. 2025-08-1807:58Listed as exploited by GCVEGCVE
  4. 2025-08-1807:58Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40875?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40875?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Gurock testrail
BranchAffectedFixed in
7.2< 7.2.0.30147.2.0.3014

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Gurock testrail to 7.2.0.3014

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-50320
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedSakuraSamuraii/derailedLul/TestRail-files.md5-IAC-scanner
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2021-09-22
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-40875?

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.

Is CVE-2021-40875 actively exploited?

Active exploitation of CVE-2021-40875 has not been confirmed. Its EPSS score was 47.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-40875?

CVE-2021-40875 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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