VulnerabilityModified
CVE-2021-30501
The flow allows attackers to cause a denial of service (abort) via a crafted file.
MEDIUM 5.5EPSS 1.04%
Does this matter?
Lower severity and a low EPSS score (1.04%). Track it; it rarely justifies an emergency change on its own.
Description
An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows attackers to cause a denial of service (abort) via a crafted file.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 1.04% probability · 64th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-617
- Affected
- upx/upx · redhat/enterprise linux · fedoraproject/fedora
- Source
- secalert@redhat.com
EPSS 1.0% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1948696Issue Tracking, Patch, Third Party Advisory
- https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46Patch, Third Party Advisory
- https://github.com/upx/upx/issues/486Exploit, Issue Tracking, Third Party Advisory
- https://github.com/upx/upx/pull/487Exploit, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1948696Issue Tracking, Patch, Third Party Advisory
- https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46Patch, Third Party Advisory
- https://github.com/upx/upx/issues/486Exploit, Issue Tracking, Third Party Advisory
- https://github.com/upx/upx/pull/487Exploit, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.