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Vulnerability details: VCID-b6ws-79hy-57dz
Vulnerability ID VCID-b6ws-79hy-57dz
Aliases CVE-2021-20231
CVE-2021-20232
GNUTLS-SA-2021-03-10
Summary A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20232.json
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00917 https://api.first.org/data/v1/epss?cve=CVE-2021-20231
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
epss 0.00844 https://api.first.org/data/v1/epss?cve=CVE-2021-20232
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-20231
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-20231
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-20232
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-20232
archlinux Low https://security.archlinux.org/AVG-1674
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.json
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20232.json
https://api.first.org/data/v1/epss?cve=CVE-2021-20231
https://api.first.org/data/v1/epss?cve=CVE-2021-20232
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20231
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20232
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e0800230168%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a14184793bb%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85feba2779%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba18822d611f7%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70db2bd158%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fdcb57495f%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81aa87e4532%40%3Cissues.spark.apache.org%3E
https://lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0b3b2bb20%40%3Cissues.spark.apache.org%3E
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OSLAE6PP33A7VYRYMYMUVB3U6B26GZER/
https://security.netapp.com/advisory/ntap-20210416-0005/
https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10
1922275 https://bugzilla.redhat.com/show_bug.cgi?id=1922275
1922276 https://bugzilla.redhat.com/show_bug.cgi?id=1922276
ASA-202103-1 https://security.archlinux.org/ASA-202103-1
AVG-1674 https://security.archlinux.org/AVG-1674
cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
CVE-2021-20231 https://nvd.nist.gov/vuln/detail/CVE-2021-20231
CVE-2021-20232 https://nvd.nist.gov/vuln/detail/CVE-2021-20232
RHSA-2021:4451 https://access.redhat.com/errata/RHSA-2021:4451
USN-5029-1 https://usn.ubuntu.com/5029-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20231.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:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20232.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:N/UI:N/S:U/C:N/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:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20231
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:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20231
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:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20232
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:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20232
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 0.74977
EPSS Score 0.00917
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:28:08.285569+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.15/main.json 37.0.0