MEDIUM
In FreeBSD 12.1-STABLE before r364644, 11.4-STABLE before r364651, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, improper handling in the kernel causes a use-after-free bug by sending large user messages from multiple threads on the same SCTP socket
Published Mar 26, 2021
5.5
MEDIUMCVSS 3.1
EPSS 0.40%
Description
In FreeBSD 12.1-STABLE before r364644, 11.4-STABLE before r364651, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, improper handling in the kernel causes a use-after-free bug by sending large user messages from multiple threads on the same SCTP socket. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.
Affected products
- Vendor n/a Product FreeBSD Defaultn/a
- Version FreeBSD 12.1-RELEASE before p9, 11.4-RELEASE before p3, 11.3-RELEASE before p13StatusaffectedConstraints-
- 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 | FreeBSD | n/a |
|
Configuration 1
OR
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.3
- 11.4
- 11.4
- 11.4
- 12.1
- 12.1
- 12.1
- 12.1
- 12.1
- 12.1
- 12.1
- 12.1
- 12.1
- 12.2
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.
5.5 MEDIUM NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
No CVSS v3.0 score for this CVE.
4.9 MEDIUM NVD
AV:L/AC:L/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
0.40% 0.00399
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
EPSS probability 0.00399
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 | 0.40% (0.00399) | 31.80th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.40% (0.00399) | 31.43th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.08% (0.00082) | 21.62th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00048) | 19.56th | v3 (v2023.03.01) |
| May 8, 2024 | 0.05% (0.00048) | 16.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00048) | 14.54th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.84% (0.05839) | 77.39th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.91% (0.01908) | 48.13th | v1 |
| Jan 6, 2022 | 1.91% (0.01908) | 47.62th | v1 |
| Jan 5, 2022 | 0.43% (0.00432) | 26.76th | v1 |
| May 1, 2021 | 0.37% (0.00370) | 0.00th | v1 |
| Apr 28, 2021 | 2.48% (0.02476) | 0.00th | v1 |
| Apr 27, 2021 | 1.45% (0.01454) | 0.00th | v1 |
| Apr 21, 2021 | 0.42% (0.00416) | 0.00th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.42% (0.00416) | 0.00th | v1 |
Weaknesses (1)
References (13)
- http://seclists.org/fulldisclosure/2021/Apr/49 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/Apr/50 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/Apr/57 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/Apr/58 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/Apr/59 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:25.sctp.asc x_refsource_MISCVendor Advisory
- https://support.apple.com/kb/HT212317 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212318 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212319 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212321 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212323 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212324 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT212325 x_refsource_CONFIRMThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://seclists.org/fulldisclosure/2021/Apr/49 | mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory | |
| http://seclists.org/fulldisclosure/2021/Apr/50 | mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory | |
| http://seclists.org/fulldisclosure/2021/Apr/57 | mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory | |
| http://seclists.org/fulldisclosure/2021/Apr/58 | mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory | |
| http://seclists.org/fulldisclosure/2021/Apr/59 | mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory | |
| https://security.FreeBSD.org/advisories/FreeBSD-SA-20:25.sctp.asc | x_refsource_MISCVendor Advisory | |
| https://support.apple.com/kb/HT212317 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212318 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212319 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212321 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212323 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212324 | x_refsource_CONFIRMThird Party Advisory | |
| https://support.apple.com/kb/HT212325 | x_refsource_CONFIRMThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner freebsd
Published Mar 26, 2021
Updated Aug 4, 2024
Reserved Jan 21, 2020
Link CVE-2020-7463
CISA Vulnrichment
Updated n/a