Medium severity · published Mar 26, 2021
CVE-2021-20285
A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96
6.6
CVSS
0.8%
EPSS
No
On KEV
Description
A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via a crafted ELF. The highest threat from this vulnerability is to system availability.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UP
Upx · Upx
3.96 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20285
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1937787
Exploit
https://github.com/upx/upx/issues/421
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