How severe is CVE-2020-23911?

CVE-2020-23911 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-23911 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23911?

CVE-2020-23911 affects Asn1c Project Asn1c. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23911?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-23911 published?

CVE-2020-23911 was published on 2023-07-18 and last updated on 2026-06-17.

CVE-2020-23911

CVE-2020-23911 is a medium-severity vulnerability in Asn1c Project Asn1c with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Asn1c Project Asn1c
Published: 2023-07-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-23911?: CVE-2020-23911 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-23911 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23911?: CVE-2020-23911 affects Asn1c Project Asn1c. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23911?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-23911 published?: CVE-2020-23911 was published on 2023-07-18 and last updated on 2026-06-17.

References

https://github.com/vlm/asn1c/issues/394

Affected products (1)

cpe:2.3:a:asn1c_project:asn1c:*:*:*:*:*:*:*:*

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Other CWE-476 (NULL Pointer Dereference) vulnerabilities

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