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Vulnerability details: VCID-7m2r-h1cd-e3hm
Vulnerability ID VCID-7m2r-h1cd-e3hm
Aliases CVE-2021-21775
Summary A use-after-free vulnerability exists in the way certain events are processed for ImageLoader objects of Webkit WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. In order to trigger the vulnerability, a victim must be tricked into visiting a malicious webpage.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21775.json
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
epss 0.00187 https://api.first.org/data/v1/epss?cve=CVE-2021-21775
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.0 https://nvd.nist.gov/vuln/detail/CVE-2021-21775
cvssv3.1 8.0 https://nvd.nist.gov/vuln/detail/CVE-2021-21775
archlinux High https://security.archlinux.org/AVG-2220
archlinux High https://security.archlinux.org/AVG-2221
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21775.json
https://api.first.org/data/v1/epss?cve=CVE-2021-21775
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21775
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21779
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30663
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30665
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30689
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30720
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30734
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30744
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30749
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30758
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30799
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1229
https://www.debian.org/security/2021/dsa-4945
http://www.openwall.com/lists/oss-security/2021/07/23/1
1986863 https://bugzilla.redhat.com/show_bug.cgi?id=1986863
ASA-202107-67 https://security.archlinux.org/ASA-202107-67
ASA-202107-68 https://security.archlinux.org/ASA-202107-68
AVG-2220 https://security.archlinux.org/AVG-2220
AVG-2221 https://security.archlinux.org/AVG-2221
cpe:2.3:a:webkitgtk:webkitgtk:2.30.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:webkitgtk:webkitgtk:2.30.4:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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-2021-21775 https://nvd.nist.gov/vuln/detail/CVE-2021-21775
RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
USN-5024-1 https://usn.ubuntu.com/5024-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21775.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:L/PR:N/UI:R/S:U/C:H/I:H/A:H 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:M/Au:S/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21775
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:L/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21775
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 0.40986
EPSS Score 0.00187
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:08.644752+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.20/community.json 37.0.0