CVE-2021-30501: fedoraproject fedora Improper Input Validation
CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-30501DEBIAN-CVE-2021-30501
Published 26-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-30501 is a medium (CVSS 5.5) Improper Input Validation vulnerability in fedoraproject fedora. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.7% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.5/10
010
Medium · v3.1 (NVD)EPSS score
1.04%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 26-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versionsMedium 5.5Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
0.00 pp
From 1.04% on 22-09-2026
22-09-202622-10-2026
EPSS score1.04%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundUpx
Maturity: poc
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-617Reachable AssertionThe product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
Affected systems
Debian1 product
- upx-ucl< 4.2.2-1
Fedoraproject1 product
- fedoraEOL33
Redhat1 product
- enterprise_linuxEOL7.0
Ubuntu1 product
- upx-uclAll versions (No fix recorded)
Upx1 product
- upx4.0.0
5 vendors · 5 products
References
7 links- bugzilla.redhat.com/show_bug.cgi?id=1948696X Refsource MISCREPORTIssue TrackingPatchThird Party Advisory
- github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46X Refsource MISCREPORTPatchThird Party Advisory
