How severe is CVE-2020-23921?

CVE-2020-23921 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2020-23921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23921?

CVE-2020-23921 affects Fast Ber Project Fast Ber. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-23921 published?

CVE-2020-23921 was published on 2021-04-21 and last updated on 2026-06-17.

CVE-2020-23921

CVE-2020-23921 is a high-severity vulnerability in Fast Ber Project Fast Ber with a CVSS 3.x base score of 7.1. 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Fast Ber Project Fast Ber
Published: 2021-04-21
Last modified: 2026-06-17

Description

An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.

Frequently asked questions

What is CVE-2020-23921?: An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.
How severe is CVE-2020-23921?: CVE-2020-23921 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2020-23921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23921?: CVE-2020-23921 affects Fast Ber Project Fast Ber. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-23921 published?: CVE-2020-23921 was published on 2021-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fast_ber_project:fast_ber:*:*:*:*:*:*:*:*

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