How severe is CVE-2021-44078?

CVE-2021-44078 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44078 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44078?

CVE-2021-44078 primarily affects Unicorn-engine Unicorn Engine. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44078?

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-2021-44078 published?

CVE-2021-44078 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-44078

CVE-2021-44078 is a high-severity vulnerability in Unicorn-engine Unicorn Engine with a CVSS 3.x base score of 8.1. 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-697.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.9
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-697
Affected product: Unicorn-engine Unicorn Engine
Published: 2021-12-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-44078?: 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.
How severe is CVE-2021-44078?: CVE-2021-44078 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44078 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44078?: CVE-2021-44078 primarily affects Unicorn-engine Unicorn Engine. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-44078?: 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-2021-44078 published?: CVE-2021-44078 was published on 2021-12-26 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:unicorn-engine:unicorn_engine:*:*:*:*:*:*:*:*
cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc4:*:*:*:*:*:*

More vulnerabilities in Unicorn-engine Unicorn Engine

CVE-2022-29692 — High (CVSS 7.8): Unicorn Engine v1.0.3 was discovered to contain a use-after-free vulnerability via the hook function.
CVE-2022-29695 — High (CVSS 7.5): Unicorn Engine v2.0.0-rc7 contains memory leaks caused by an incomplete unicorn engine initialization.
CVE-2022-29694 — High (CVSS 7.5): Unicorn Engine v2.0.0-rc7 and below was discovered to contain a NULL pointer dereference via qemu_ram_free.
CVE-2022-29693 — High (CVSS 7.5): Unicorn Engine v2.0.0-rc7 and below was discovered to contain a memory leak via the function uc_close at…
CVE-2021-36979 — Medium (CVSS 5.5): Unicorn Engine 1.0.2 has an out-of-bounds write in tb_flush_armeb (called from cpu_arm_exec_armeb and…
CVE-2020-36431 — Medium (CVSS 5.5): Unicorn Engine 1.0.2 has an out-of-bounds write in helper_wfe_arm.

All CVEs affecting Unicorn-engine Unicorn Engine →

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