What is CVE-2021-33641?

CVE-2021-33641 is a high-severity vulnerability in Openeuler Byacc, classified under Use After Free. CVSS score: 7.8/10. Published 2023-01-20.

How severe is CVE-2021-33641?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Openeuler Byacc

CVE-2021-33641

When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).

Vulnerability class: Use-After-Free

EPSS: 0.003 (19.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Openeuler Byacc
N/a Byacc — versions <1.9.20200330 and <2.0.20210808

Weakness classification (CWE)

CWE-416 — Use After Free

References

securities@openeuler.org (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33641?: CVE-2021-33641 is a high-severity vulnerability in Openeuler Byacc, classified under Use After Free. CVSS score: 7.8/10. Published 2023-01-20.
How severe is CVE-2021-33641?: High severity. CVSS v3 base score is 7.8 out of 10.