CVE-2023-21640
Buffer Copy Without Checking Size of Input in Linux
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Buffer Copy Without Checking Size of Input in Linux
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
- Record
CVE-2023-21640- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
EUVDEUVD-2023-25807
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
- Record
EUVD-2023-25807- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f8q5-x346-4rf5
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
- Record
GHSA-f8q5-x346-4rf5- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120, CWE-787
- Updated
- 2026-11-02
NVD
Memory corruption in Linux when the file upload API is called with parameters having large buffer.
- Record
CVE-2023-21640- CVSS 3.1
- 6.7 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120, CWE-787
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-21640 is a medium vulnerability (CVSS 6.7) in Qualcomm Fastconnect 6900 Firmware, published July 4, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.11%, the 1st percentile. No source names a fixed version.