What is CVE-2020-23911?

CVE-2020-23911 is a medium-severity vulnerability in Asn1c Project, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2023-07-18.

How severe is CVE-2020-23911?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Asn1c Project

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.

Published 2023-07-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Asn1c Project

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/vlm/asn1c/issues/394 (Exploit, Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2020-23911?: CVE-2020-23911 is a medium-severity vulnerability in Asn1c Project, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2023-07-18.
How severe is CVE-2020-23911?: Medium severity. CVSS v3 base score is 5.5 out of 10.