PatchTheCVECVE-2020-23911: An issue was discovered in asn1c through v0.9.28
CVE-2020-23911 is a medium-severity flaw (CVSS 5.5) affecting asn1c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2023-07-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-23911?
asn1c: upgrade to newer than 0.9.28. Exact commands for each OS are on this page.
Is CVE-2020-23911 being exploited?
CVE-2020-23911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-23911 affect?
CVE-2020-23911 affects asn1c. Severity is medium (CVSS 5.5). 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.
How urgent is CVE-2020-23911?
Priority 30/100. Public exploit reference
Related CVEs
- CVE-2020-23910 MEDIUM 5.5 UPGRADE Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.