The IsDriveLetterAvailable method in Driver/Ntdriver.c in TrueCrypt 7.0, VeraCrypt before 1.15, and CipherShed, when running on Windows, does not properly validate drive letter symbolic links, which allows local users to mount an encrypted volume over an existing drive letter and gain privileges via an entry in the /GLOBAL?? directory
Published Oct 2, 2017
7.8
HIGHCVSS 3.0
EPSS 1.21%
Description
The IsDriveLetterAvailable method in Driver/Ntdriver.c in TrueCrypt 7.0, VeraCrypt before 1.15, and CipherShed, when running on Windows, does not properly validate drive letter symbolic links, which allows local users to mount an encrypted volume over an existing drive letter and gain privileges via an entry in the /GLOBAL?? directory.
Affected products
No data.
- ≤ 0.7.5.0
- ≤ 1.14
- 7.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.21% (0.01205) | 67.20th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.20% (0.01195) | 63.94th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.96% (0.00957) | 74.39th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.34% (0.02342) | 74.78th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.96% (0.00957) | 74.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00061) | 27.92th | v3 (v2023.03.01) |
| May 31, 2024 | 0.06% (0.00061) | 25.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00061) | 23.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.11% (0.02115) | 80.01th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.11% (0.02115) | 78.09th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.11% (0.02115) | 56.78th | v2 (v2022.01.01) |
References (6)
- http://packetstormsecurity.com/files/133878/Truecrypt-7-Derived-Code-Windows-Drive-Letter-Symbolic-Link-Creation-Privilege-Escalation.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2015/09/22/7 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2015/09/24/3 mailing-listx_refsource_MLISTIssue TrackingMailing ListThird Party Advisory
- https://code.google.com/p/google-security-research/issues/detail?id=538 x_refsource_MISCThird Party Advisory
- https://veracrypt.codeplex.com/wikipage?title=Release%20Notes x_refsource_CONFIRMRelease NotesVendor Advisory
- https://www.exploit-db.com/exploits/38403/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://packetstormsecurity.com/files/133878/Truecrypt-7-Derived-Code-Windows-Drive-Letter-Symbolic-Link-Creation-Privilege-Escalation.html | x_refsource_MISCThird Party AdvisoryVDB Entry | |
| http://www.openwall.com/lists/oss-security/2015/09/22/7 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.openwall.com/lists/oss-security/2015/09/24/3 | mailing-listx_refsource_MLISTIssue TrackingMailing ListThird Party Advisory | |
| https://code.google.com/p/google-security-research/issues/detail?id=538 | x_refsource_MISCThird Party Advisory | |
| https://veracrypt.codeplex.com/wikipage?title=Release%20Notes | x_refsource_CONFIRMRelease NotesVendor Advisory | |
| https://www.exploit-db.com/exploits/38403/ | exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.