CVE-2021-33642
Medium
Published: 20 January 2023
Published
20 January 2023
Modified
02 April 2025
KEV Added
—
Patch
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CVSS Score v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score
0.0011
29.5th percentile
Risk Priority
11
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-33642 is a medium-severity Infinite Loop (CWE-835) vulnerability in Openeuler Byacc. Its CVSS base score is 5.5 (Medium).
Operationally, ranked at the 29.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-20319
Vulnerability details
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
openeuler
byacc
≤ 1.9.20200330 · 2.0 — 2.0.20210808
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.