PatchTheCVECVE-2021-44078: An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5
CVE-2021-44078 is a high-severity flaw (CVSS 8.1) affecting unicorn engine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Local |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 54%) |
| CISA exploited list | No |
| Weakness | CWE-697 |
| Published | 2021-12-26 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-44078?
unicorn engine: upgrade to newer than 1.0.3. Exact commands for each OS are on this page.
Is CVE-2021-44078 being exploited?
CVE-2021-44078 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-44078 affect?
CVE-2021-44078 affects unicorn engine. Severity is high (CVSS 8.1). 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
How urgent is CVE-2021-44078?
Priority 40/100. High severity
Related CVEs
- CVE-2022-29695 HIGH 7.5 UPGRADE Unicorn Engine v2.0.0-rc7 contains memory leaks caused by an incomplete unicorn engine initialization.
- CVE-2022-29694 HIGH 7.5 UPGRADE Unicorn Engine v2.0.0-rc7 and below was discovered to contain a NULL pointer dereference via qemu_ram_free.
- CVE-2022-29693 HIGH 7.5 UPGRADE Unicorn Engine v2.0.0-rc7 and below was discovered to contain a memory leak via the function uc_close at /my/u
- CVE-2022-29692 HIGH 7.8 DOWNGRADE Unicorn Engine v1.0.3 was discovered to contain a use-after-free vulnerability via the hook function.
- CVE-2021-36979 MEDIUM 5.5 DOWNGRADE MITIGATE Unicorn Engine 1.0.2 has an out-of-bounds write in tb_flush_armeb (called from cpu_arm_exec_armeb and tcg_cpu_