CVE-2021-33642
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
- Record
CVE-2021-33642- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
CVE List
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
- Record
CVE-2021-33642- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
EUVDEUVD-2021-20319
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
- Record
EUVD-2021-20319- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q8mx-78gm-98mh
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
- Record
GHSA-q8mx-78gm-98mh- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
OSVOESA-2023-1033
byacc security update
Berkeley Yacc is an LALR(1) parser generator. Berkeley Yacc has been made as compatible as possible with AT&T Yacc. Berkeley Yacc can accept any input specification that conforms to the AT&T Yacc documentation. Specifications that take advantage of undocumented features of AT&T Yacc will probably be rejected.
Security Fix(es):
No description is available for this CVE.(CVE-2021-33641)
No description is available for this CVE.(CVE-2021-33642)
- Record
OESA-2023-1033- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
byaccopenEuler:20.03-LTS-SP1 From an advisory covering 2 CVEs |
before 1.9.20200330-2.oe1 | 1.9.20200330-2.oe1 |
byaccopenEuler:20.03-LTS-SP3 From an advisory covering 2 CVEs |
before 1.9.20200330-2.oe1 | 1.9.20200330-2.oe1 |
byaccopenEuler:22.03-LTS From an advisory covering 2 CVEs |
before 2.0.20210808-4.oe2203sp1 | 2.0.20210808-4.oe2203sp1 |
byaccopenEuler:22.03-LTS-SP1 From an advisory covering 2 CVEs |
before 2.0.20210808-4.oe2203sp1 | 2.0.20210808-4.oe2203sp1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33642 is a medium vulnerability (CVSS 5.5) in Openeuler Byacc, published January 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.23%, the 13th percentile. No source names a fixed version.