CVE-2021-20266: fedoraproject fedora Out-of-bounds Read
CVSS: 4.9v3.1MediumModified
AliasesRHSA-2021:4489UBUNTU-CVE-2021-20266DEBIAN-CVE-2021-20266
Published 30-04-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-20266 is a medium (CVSS 4.9) Out-of-bounds Read vulnerability in fedoraproject fedora. EPSS estimates a 1.64% chance of exploitation in the next 30 days, higher than 76% of scored vulnerabilities.
CVSS score
4.9/10
010
Medium · v3.1 (NVD)EPSS score
1.64%
0%100%
Low · -0.07 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 30-04-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in RPM's hdrblobInit() in lib/header.c. This flaw allows an attacker who can modify the rpmdb to cause an out-of-bounds read. The highest threat from this vulnerability is to system availability.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 4.9Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:HSources4 sources · 3.1–4.9
- OSV · Red hatEcosystem advisory · calculated3.1LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.64%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
-0.07 pp
From 1.71% on 19-09-2026
19-09-202619-10-2026
EPSS score1.64%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat29 products
- python3-rpm< 0:4.14.3-19.el8
- python3-rpm-debuginfo< 0:4.14.3-19.el8
- rpm< 0:4.14.3-19.el8
- rpm-apidocs< 0:4.14.3-19.el8
- rpm-build< 0:4.14.3-19.el8
Debian1 product
- rpm< 4.16.1.2+dfsg1-1
Fedoraproject1 product
- fedoraEOL33 | 34
Rpm1 product
- rpm< 4.16.1.3
Ubuntu1 product
- rpm< 4.14.1+dfsg1-2ubuntu0.1~esm1 | < 4.14.2.1+dfsg1-1ubuntu0.1~esm1
5 vendors · 33 products
References
18 links- bugzilla.redhat.com/show_bug.cgi?id=1927741X Refsource MISCREPORTIssue TrackingPatchThird Party Advisory
- lists.fedoraproject.org/archives/…X Refsource MISC
- lists.fedoraproject.org/archives/…X Refsource MISC
