HIGH
In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file
Published Jul 5, 2021
7.8
HIGHCVSS 3.1
EPSS 1.64%
Description
In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
7.8 HIGH NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
6.8 MEDIUM NVD
AV:N/AC:M/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
1.64% 0.01639
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
EPSS probability 0.01639
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.64% (0.01639) | 75.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.64% (0.01639) | 73.20th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.55% (0.00551) | 66.02th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.50% (0.00499) | 77.09th | v3 (v2023.03.01) |
| Jun 10, 2024 | 0.41% (0.00413) | 73.97th | v3 (v2023.03.01) |
| Mar 20, 2024 | 0.39% (0.00391) | 72.81th | v3 (v2023.03.01) |
| Feb 9, 2024 | 0.34% (0.00342) | 70.71th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.30% (0.00297) | 68.52th | v3 (v2023.03.01) |
| Sep 27, 2023 | 0.30% (0.00297) | 65.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.25% (0.00248) | 60.83th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.56% (0.01559) | 75.09th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.56% (0.01559) | 73.04th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.68% (0.02682) | 61.90th | v2 (v2022.01.01) |
| Feb 3, 2022 | 7.67% (0.07673) | 84.22th | v1 |
| Jan 6, 2022 | 7.67% (0.07673) | 84.07th | v1 |
| Jan 5, 2022 | 1.82% (0.01819) | 75.45th | v5 (v2026.06.15) |
| Jul 6, 2021 | 1.82% (0.01819) | 0.00th | v1 |
Weaknesses (1)
References (4)
- https://core.tcl-lang.org/tcl/info/28ef6c0c741408a2 x_refsource_MISCExploitPatchVendor Advisory
- https://core.tcl-lang.org/tcl/info/bad6cc213dfe8280 x_refsource_MISCExploitVendor Advisory
- https://github.com/tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222 x_refsource_MISCPatchThird Party Advisory
- https://sqlite.org/forum/info/7dcd751996c93ec9 x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://core.tcl-lang.org/tcl/info/28ef6c0c741408a2 | x_refsource_MISCExploitPatchVendor Advisory | |
| https://core.tcl-lang.org/tcl/info/bad6cc213dfe8280 | x_refsource_MISCExploitVendor Advisory | |
| https://github.com/tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222 | x_refsource_MISCPatchThird Party Advisory | |
| https://sqlite.org/forum/info/7dcd751996c93ec9 | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jul 5, 2021
Updated Aug 4, 2024
Reserved Jun 23, 2021
Link CVE-2021-35331
CISA Vulnrichment
Updated n/a