{"cve":"CVE-2021-44078","nvd":{"published":"2021-12-26T05:15:07.270","modified":"2026-06-17T04:11:52.607","status":"Modified","description":"An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5. It allows local attackers to escape the sandbox. An attacker must first obtain the ability to execute crafted code in the target sandbox in order to exploit this vulnerability. The specific flaw exists within the virtual memory manager. The issue results from the faulty comparison of GVA and GPA while calling uc_mem_map_ptr to free part of a claimed memory block. An attacker can leverage this vulnerability to escape the sandbox and execute arbitrary code on the host machine.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","score":8.1},"cwes":["CWE-697"],"references":["https://gist.github.com/jwang-a/cb4b6e9551457aa299066076b836a2cd","https://github.com/jwang-a/CTF/blob/master/MyChallenges/Pwn/Unicorns_Aisle/UnicornsAisle.pdf","https://github.com/unicorn-engine/unicorn/commit/c733bbada356b0373fa8aa72c044574bb855fd24","https://github.com/unicorn-engine/unicorn/compare/2.0.0-rc4...2.0.0-rc5","https://www.unicorn-engine.org/changelog/"],"products":["unicorn-engine:unicorn_engine"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-44078","score":0.00546,"percentile":0.45784,"date":"2026-10-31"},"kev":null,"osv":[{"id":"PYSEC-2021-868","url":"https://osv.dev/vulnerability/PYSEC-2021-868","summary":"","modified":"2023-11-08T04:07:15.451665Z","packages":[{"ecosystem":"PyPI","name":"unicorn","purl":"pkg:pypi/unicorn","ranges":["<2.0.0rc1"],"fixed":["2.0.0rc1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}