UPX 4.0.0 Mach-O File bele.h get_le32 heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability was found in UPX 4.0.0. It has been rated as critical. This affects the function get_le32 of the file bele.h of the component Mach-O File Handler. This manipulation causes heap-based overflow. The identification of this vulnerability is CVE-2020-27800. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in UPX 4.0.0 and classified as critical. Affected by this vulnerability is the function get_le32 of the file bele.h of the component Mach-O File Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A heap-based buffer over-read was discovered in the get_le32 function in bele.h in UPX 4.0.0 via a crafted Mach-O file.

The weakness was shared 08/26/2022 as 395. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2020-27800 since 10/27/2020. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/11/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/27/2020 🔍
08/26/2022 +667 days 🔍
08/26/2022 +0 days 🔍
04/11/2025 +959 days 🔍

Sourcesinfo

Product: github.com

Advisory: 395
Status: Confirmed

CVE: CVE-2020-27800 (🔍)
GCVE (CVE): GCVE-0-2020-27800
GCVE (VulDB): GCVE-100-207319

Entryinfo

Created: 08/26/2022 09:07
Updated: 04/11/2025 16:34
Changes: 08/26/2022 09:07 (40), 10/02/2022 07:22 (11), 04/11/2025 16:34 (15)
Complete: 🔍
Cache ID: 216::103

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