CVE-2020-23921
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap...
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
- Record
CVE-2020-23921- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
- Record
CVE-2020-23921- Updated
- 2026-11-02
EUVDEUVD-2020-16658 No score
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
- Record
EUVD-2020-16658- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5v8f-79pq-pg2j
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap...
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
- Record
GHSA-5v8f-79pq-pg2j- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
OSV
An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
- Record
CVE-2020-23921- CVSS 3.1
- 7.1 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-23921 is a high vulnerability (CVSS 7.1) in Fast Ber Project Ber, published April 21, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. No source names a fixed version.