CVE-2021-44078

Name: CVE-2021-44078
Creator: NVD / NIST
Published: 2021-12-26T05:15:07.27+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2021-44078 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.53%

40.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-697

Affected Software

Vendor	Product	Versions	Update
Unicorn-Engine	Unicorn Engine	<= 1.0.3	—
Unicorn-Engine	Unicorn Engine	2.0.0	Rc1

References

https://gist.github.com/jwang-a/cb4b6e9551457aa299066076b836a2cdThird Party Advisory
https://github.com/jwang-a/CTF/blob/master/MyChallenges/Pwn/Unicorns_Aisle/UnicornsAisle.pdfThird Party Advisory
https://github.com/unicorn-engine/unicorn/commit/c733bbada356b0373fa8aa72c044574bb855fd24Patch, Third Party Advisory
https://github.com/unicorn-engine/unicorn/compare/2.0.0-rc4...2.0.0-rc5Patch, Third Party Advisory
https://www.unicorn-engine.org/changelog/Vendor Advisory
https://gist.github.com/jwang-a/cb4b6e9551457aa299066076b836a2cdThird Party Advisory
https://github.com/jwang-a/CTF/blob/master/MyChallenges/Pwn/Unicorns_Aisle/UnicornsAisle.pdfThird Party Advisory
https://github.com/unicorn-engine/unicorn/commit/c733bbada356b0373fa8aa72c044574bb855fd24Patch, Third Party Advisory
https://github.com/unicorn-engine/unicorn/compare/2.0.0-rc4...2.0.0-rc5Patch, Third Party Advisory
https://www.unicorn-engine.org/changelog/Vendor Advisory

Timeline

Published: Dec 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44078?

How severe is CVE-2021-44078?

CVE-2021-44078 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44078?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-44078?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST