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Vulnerability details: VCID-1gkq-3yfu-fke8
Vulnerability ID VCID-1gkq-3yfu-fke8
Aliases CVE-2021-20266
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 4.4
Risk 2.2
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 3.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20266.json
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2021-20266
cvssv3.1 3.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.0 https://nvd.nist.gov/vuln/detail/CVE-2021-20266
cvssv3.1 4.9 https://nvd.nist.gov/vuln/detail/CVE-2021-20266
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20266.json
https://api.first.org/data/v1/epss?cve=CVE-2021-20266
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20266
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMGXO3W6DHPO62GJ4VVF5DEUX5DRUR5K/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHRPNBCRPDJHHQE3MBPSZK4H7X2IM7AC/
https://security.gentoo.org/glsa/202107-43
1927741 https://bugzilla.redhat.com/show_bug.cgi?id=1927741
985308 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985308
cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CVE-2021-20266 https://nvd.nist.gov/vuln/detail/CVE-2021-20266
RHSA-2021:4489 https://access.redhat.com/errata/RHSA-2021:4489
USN-USN-5273-1 https://usn.ubuntu.com/USN-5273-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20266.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20266
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20266
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.21071
EPSS Score 0.00067
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:37:59.686834+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.13/community.json 37.0.0