CVE-2021-33641

Published: Jan 20, 2023Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

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

Affected (2)

Products: Openeuler: Byacc

Openeuler

1 product

Byacc

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Openeuler Byacc	Before 1.9.20200330
Openeuler Byacc	From 2.0 to 2.0.20210808

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (2)

https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d

Source: securities@openeuler.org

Permissions RequiredThird Party Advisory

https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d

Source: af854a3a-2127-422b-91ae-364da2661108

Permissions RequiredThird Party Advisory

Timeline

No history available yet.