A untrusted search path issue was found in Calibre at devices/linux_mount_helper.c leading to the ability of unprivileged users to execute any program as root
Published Oct 27, 2021
9.8
CRITICALCVSS 3.1
EPSS 2.31%
Description
A untrusted search path issue was found in Calibre at devices/linux_mount_helper.c leading to the ability of unprivileged users to execute any program as root.
Affected products
- Vendor n/a Product Calibre Defaultn/a
- Version unknownStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Calibre | n/a |
|
- n/a
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/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 (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.31% (0.02308) | 82.74th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.23% (0.02235) | 80.43th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.68% (0.00677) | 69.81th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.41% (0.00410) | 74.71th | v3 (v2023.03.01) |
| Jul 12, 2024 | 0.41% (0.00410) | 74.07th | v3 (v2023.03.01) |
| Jun 2, 2024 | 0.37% (0.00372) | 72.63th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.31% (0.00306) | 69.00th | v3 (v2023.03.01) |
| Jan 18, 2024 | 0.31% (0.00306) | 66.71th | v3 (v2023.03.01) |
| Jun 17, 2023 | 0.24% (0.00237) | 60.52th | v3 (v2023.03.01) |
| May 19, 2023 | 0.22% (0.00217) | 58.23th | v3 (v2023.03.01) |
| Apr 8, 2023 | 0.16% (0.00156) | 50.47th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.14% (0.00143) | 48.33th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
References (4)
- https://bugs.launchpad.net/calibre/+bug/885027 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://git.zx2c4.com/calibre-mount-helper-exploit/about/ x_refsource_MISCExploitThird Party Advisory
- https://lwn.net/Articles/464824/ x_refsource_MISCNot ApplicableThird Party Advisory
- https://www.openwall.com/lists/oss-security/2011/11/02/2 x_refsource_MISCMailing ListThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://bugs.launchpad.net/calibre/+bug/885027 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://git.zx2c4.com/calibre-mount-helper-exploit/about/ | x_refsource_MISCExploitThird Party Advisory | |
| https://lwn.net/Articles/464824/ | x_refsource_MISCNot ApplicableThird Party Advisory | |
| https://www.openwall.com/lists/oss-security/2011/11/02/2 | x_refsource_MISCMailing ListThird Party Advisory |
Change history (0)
No recorded changes yet.