CVE-2021-39991
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU...
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU.Successful exploitation of this vulnerability may affect service confidentiality.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU.Successful exploitation of this vulnerability may affect service confidentiality.
- Record
CVE-2021-39991- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU.Successful exploitation of this vulnerability may affect service confidentiality.
- Record
CVE-2021-39991- Updated
- 2026-11-02
EUVDEUVD-2021-26347 No score
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU.Successful exploitation of this vulnerability may affect service confidentiality.
- Record
EUVD-2021-26347- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w5fm-h2vx-gp8q
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU...
There is an unauthorized rewriting vulnerability with the memory access management module on ACPU.Successful exploitation of this vulnerability may affect service confidentiality.
- Record
GHSA-w5fm-h2vx-gp8q- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39991 is a medium vulnerability (CVSS 5.5) in Huawei Emui, published February 9, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 7th percentile. No source names a fixed version.