CVE-2020-23911
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the...
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
CVE-2020-23911- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
CVE-2020-23911- Updated
- 2026-11-02
EUVDEUVD-2020-16648 No score
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
EUVD-2020-16648- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g4q7-qpw3-v546
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the...
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
GHSA-g4q7-qpw3-v546- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-476
- Updated
- 2026-11-02
OSV
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
CVE-2020-23911- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2020-23911
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
DEBIAN-CVE-2020-23911- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-23911
An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.
- Record
UBUNTU-CVE-2020-23911- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
asn1cDebian:12 |
All versions, plus listed versions 0.9.28+dfsg-50.9.28+dfsg-60.9.28+dfsg-7 |
None known |
asn1cDebian:13 |
All versions, plus listed versions 0.9.28+dfsg-50.9.28+dfsg-60.9.28+dfsg-7 |
None known |
asn1cDebian:14 |
All versions, plus listed versions 0.9.28+dfsg-50.9.28+dfsg-60.9.28+dfsg-7 |
None known |
asn1cUbuntu:16.04:LTS |
All versions, plus listed versions 0.9.24+dfsg-1 |
None known |
asn1cUbuntu:18.04:LTS |
All versions, plus listed versions 0.9.28+dfsg-2 |
None known |
asn1cUbuntu:20.04:LTS |
All versions, plus listed versions 0.9.28+dfsg-3 |
None known |
asn1cUbuntu:22.04:LTS |
All versions, plus listed versions 0.9.28+dfsg-3 |
None known |
asn1cUbuntu:24.04:LTS |
All versions, plus listed versions 0.9.28+dfsg-5 |
None known |
asn1cUbuntu:25.10 |
All versions, plus listed versions 0.9.28+dfsg-5 |
None known |
asn1cUbuntu:26.10 |
All versions, plus listed versions 0.9.28+dfsg-60.9.28+dfsg-7 |
None known |
asn1cUbuntu:26.04:LTS |
All versions, plus listed versions 0.9.28+dfsg-50.9.28+dfsg-5build10.9.28+dfsg-6 |
None known |
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-2020-23911 is a medium vulnerability (CVSS 5.5) in Asn1c Project Asn1c, published July 18, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.