Search for vulnerabilities
Vulnerability details: VCID-w679-7paa-4kf2
Vulnerability ID VCID-w679-7paa-4kf2
Aliases CVE-2021-21806
Summary An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.3 x64. A specially crafted HTML web page can cause a use-after-free condition, resulting in remote code execution. The victim needs to visit a malicious web site to trigger the vulnerability.
Status Published
Exploitability 0.5
Weighted Severity 7.9
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-2021-21806.json
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
epss 0.01595 https://api.first.org/data/v1/epss?cve=CVE-2021-21806
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-21806
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-21806
archlinux Medium https://security.archlinux.org/AVG-2214
archlinux Medium https://security.archlinux.org/AVG-2215
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21806.json
https://api.first.org/data/v1/epss?cve=CVE-2021-21806
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27918
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-29623
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1765
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1789
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1799
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1801
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1870
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21806
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1214
http://www.openwall.com/lists/oss-security/2021/07/23/1
1980441 https://bugzilla.redhat.com/show_bug.cgi?id=1980441
AVG-2214 https://security.archlinux.org/AVG-2214
AVG-2215 https://security.archlinux.org/AVG-2215
cpe:2.3:a:webkitgtk:webkitgtk:2.30.3:*:*:*:*:*:x64:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:webkitgtk:webkitgtk:2.30.3:*:*:*:*:*:x64:*
CVE-2021-21806 https://nvd.nist.gov/vuln/detail/CVE-2021-21806
RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364
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-2021-21806.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:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21806
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:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21806
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 0.80896
EPSS Score 0.01595
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:30:47.369668+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.17/community.json 37.0.0