High severity · published May 27, 2021
CVE-2021-30500
Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0
7.8
CVSS
1.2%
EPSS
No
On KEV
Description
Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0 · source: NVD
FE
Fedora · Fedoraproject
33 · source: NVD
UP
Upx · Upx
4.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30500
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-30500
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1948692
Patch
https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc
Exploit
https://github.com/upx/upx/issues/485
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