CVE-2021-30500
CVSS v3
7.8
HIGH
EPSS Score
1.2 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-05-27
Frequently asked questions
What is CVE-2021-30500?
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.
Is CVE-2021-30500 actively exploited?
Active exploitation of CVE-2021-30500 has not been confirmed. Its EPSS score was 1.2% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-30500?
CVE-2021-30500 has a CVSS v3 base score of 7.8 (HIGH severity).
Is CVE-2021-30500 affecting your environment?
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