CVE-2020-15889
CVE-2020-15889 is a critical-severity vulnerability in Lua with a CVSS 3.x base score of 9.8. 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-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 2% (81st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Lua
- Published:
- Last modified:
Description
Lua 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c uses markold for an insufficient number of list members.
Frequently asked questions
- What is CVE-2020-15889?
- Lua 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c uses markold for an insufficient number of list members.
- How severe is CVE-2020-15889?
- CVE-2020-15889 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-15889 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-15889?
- CVE-2020-15889 affects Lua. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-15889?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-15889 published?
- CVE-2020-15889 was published on 2020-07-21 and last updated on 2026-06-17.
References
- http://lua-users.org/lists/lua-l/2020-07/msg00078.html
- http://lua-users.org/lists/lua-l/2020-12/msg00157.html
- https://github.com/lua/lua/commit/127e7a6c8942b362aa3c6627f44d660a4fb75312
Affected products (1)
- cpe:2.3:a:lua:lua:5.4.0:*:*:*:*:*:*:*
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