CVE-2021-33641
HIGHCVSS 7.8/10EPSS 0.27%
Last modified
CVE-2021-33641 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openeuler | Byacc | < 1.9.20200330 |
| Openeuler | Byacc | >= 2.0, < 2.0.20210808 |
References
- https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4dPermissions Required, Third Party Advisory
- https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4dPermissions Required, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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).
How severe is CVE-2021-33641?
CVE-2021-33641 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33641?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-33641?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST