Vulnerability Details : CVE-2021-20285
Potential exploit
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.
Vulnerability category: OverflowMemory CorruptionDenial of service
Products affected by CVE-2021-20285
- cpe:2.3:a:upx_project:upx:3.96:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20285
0.24%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 45 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20285
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
8.3
|
HIGH | AV:N/AC:M/Au:N/C:P/I:P/A:C |
8.6
|
8.5
|
NIST | |
|
6.6
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
1.8
|
4.7
|
NIST |
CWE ids for CVE-2021-20285
-
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.Assigned by: secalert@redhat.com (Secondary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-20285
-
https://github.com/upx/upx/issues/421
canPack@p_lx_elf.cpp:2571 BufferOverflow (both latest release version and devel version) · Issue #421 · upx/upx · GitHubExploit;Issue Tracking;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1937787
1937787 – (CVE-2021-20285) CVE-2021-20285 upx: Illegal memory access in canPack function in p_lx_elf.cppIssue Tracking;Third Party Advisory
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