HIGH
UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile)
Published Jul 1, 2021
7.8
HIGHCVSS 3.1
EPSS 1.22%
Description
UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile).
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.
1.22% 0.01222
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.01222
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.22% (0.01222) | 67.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.23% (0.01228) | 64.84th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.36% (0.00360) | 56.04th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.23% (0.00234) | 62.32th | v3 (v2023.03.01) |
| Mar 16, 2024 | 0.19% (0.00194) | 56.04th | v3 (v2023.03.01) |
| Sep 22, 2023 | 0.14% (0.00139) | 48.92th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.11% (0.00107) | 41.83th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00954) | 16.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.58th | v5 (v2026.06.15) |
| Jul 1, 2021 | 0.83% (0.00833) | 0.00th | v1 |
Weaknesses (1)
References (3)
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4373 x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
- https://github.com/aawc/unrar/commit/0ff832d31470471803b175cfff4e40c1b08ee779 x_refsource_MISCPatchThird Party Advisory
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/unrar/OSV-2017-104.yaml x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4373 | x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory | |
| https://github.com/aawc/unrar/commit/0ff832d31470471803b175cfff4e40c1b08ee779 | x_refsource_MISCPatchThird Party Advisory | |
| https://github.com/google/oss-fuzz-vulns/blob/main/vulns/unrar/OSV-2017-104.yaml | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jul 1, 2021
Updated Aug 5, 2024
Reserved Jul 1, 2021
Link CVE-2017-20006
CISA Vulnrichment
Updated n/a