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CVE-2020-27799

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX...

7.8 HighFix available

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.33%Down 0.6 points since Aug 26, 2022
90%50%10%1%

What each source reports

NVD Score used 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-119, CWE-125
Updated
2026-11-02
CVE List No score

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
CVE-2020-27799
Weakness
CWE-119
Updated
2026-11-02
EUVDEUVD-2020-20301 No score

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
EUVD-2020-20301
Updated
2026-11-03
GitHub AdvisoriesGHSA-mj66-hgqf-6qqw 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX...

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
GHSA-mj66-hgqf-6qqw
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-119, CWE-125
Updated
2026-11-02
OSVALPINE-CVE-2020-27799 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
ALPINE-CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSVBELL-CVE-2020-27799 7.8

CVE-2020-27799 does not affect BellSoft software

Record
BELL-CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2020-27799 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
DEBIAN-CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-27799 7.8

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Record
UBUNTU-CVE-2020-27799
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
upx
Alpine:v3.17
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.18
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.19
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.20
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.21
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.22
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.23
 before 4.0.0-r0
4.0.0-r0
upx
Alpine:v3.24
 before 4.0.0-r0
4.0.0-r0
upx-ucl
Debian:13
 before 4.2.2-1
4.2.2-1
upx-ucl
Debian:14
 before 4.2.2-1
4.2.2-1
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Affected packages
PackageAffectedFixed
upx-ucl
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.95-23.95-2build1
 None known
upx-ucl
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.96-23.96-3
 None known
upx-ucl
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.96-34.2.2-3
 None known
upx-ucl
Ubuntu:25.10
 All versions, plus listed versions
4.2.4-14.2.4-1.1
 None known
upx-ucl
Ubuntu:26.10
 All versions, plus listed versions
4.2.4-1.1build1
 None known
upx-ucl
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.2.4-1.14.2.4-1.1build1
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-27799 is a high vulnerability (CVSS 7.8) in Upx, published August 25, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 25th percentile. Fixed in upx 4.0.0-r0.

References

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