CVE-2021-45985
CVE-2021-45985 is a high-severity vulnerability in Lua with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (70th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Lua
- Published:
- Last modified:
Description
In Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.
Frequently asked questions
- What is CVE-2021-45985?
- In Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.
- How severe is CVE-2021-45985?
- CVE-2021-45985 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-45985 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-45985?
- CVE-2021-45985 affects Lua. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-45985?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-45985 published?
- CVE-2021-45985 was published on 2023-04-10 and last updated on 2026-06-17.
References
- http://lua-users.org/lists/lua-l/2021-12/msg00019.html
- https://github.com/lua/lua/commit/cf613cdc6fa367257fc61c256f63d917350858b5
- https://www.lua.org/bugs.html#5.4.3-11
Affected products (1)
- cpe:2.3:a:lua:lua:*:*:*:*:*:*:*:*
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