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Vulnerability details: VCID-bdy2-8gub-tfe6
Vulnerability ID VCID-bdy2-8gub-tfe6
Aliases CVE-2021-22945
Summary Double Free When sending data to an MQTT server, libcurl could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.
Status Published
Exploitability 0.5
Weighted Severity 8.2
Risk 4.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-415 Double Free
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-416 Use After Free
System Score Found at
cvssv3 9.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-22945.json
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
epss 0.00353 https://api.first.org/data/v1/epss?cve=CVE-2021-22945
cvssv3.1 9.1 https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
ssvc Track https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
cvssv3.1 Medium https://curl.se/docs/CVE-2021-22945.html
cvssv3.1 9.1 http://seclists.org/fulldisclosure/2022/Mar/29
ssvc Track http://seclists.org/fulldisclosure/2022/Mar/29
cvssv3.1 6.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 9.1 https://hackerone.com/reports/1269242
ssvc Track https://hackerone.com/reports/1269242
cvssv3.1 9.1 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
cvssv3.1 9.1 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
archlinux High https://security.archlinux.org/AVG-2384
archlinux High https://security.archlinux.org/AVG-2385
archlinux High https://security.archlinux.org/AVG-2386
archlinux High https://security.archlinux.org/AVG-2387
archlinux High https://security.archlinux.org/AVG-2388
archlinux High https://security.archlinux.org/AVG-2389
cvssv3.1 9.1 https://security.gentoo.org/glsa/202212-01
ssvc Track https://security.gentoo.org/glsa/202212-01
cvssv3.1 9.1 https://security.netapp.com/advisory/ntap-20211029-0003/
ssvc Track https://security.netapp.com/advisory/ntap-20211029-0003/
cvssv3.1 9.1 https://support.apple.com/kb/HT213183
ssvc Track https://support.apple.com/kb/HT213183
cvssv3.1 9.1 https://www.debian.org/security/2022/dsa-5197
ssvc Track https://www.debian.org/security/2022/dsa-5197
cvssv3.1 9.1 https://www.oracle.com/security-alerts/cpuoct2021.html
ssvc Track https://www.oracle.com/security-alerts/cpuoct2021.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-22945.json
https://api.first.org/data/v1/epss?cve=CVE-2021-22945
https://curl.se/docs/CVE-2021-22945.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22898
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22924
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22945
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22946
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22947
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22576
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27774
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27775
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27776
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27781
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27782
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32205
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32206
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32207
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32208
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://hackerone.com/reports/1269242
2001527 https://bugzilla.redhat.com/show_bug.cgi?id=2001527
29 http://seclists.org/fulldisclosure/2022/Mar/29
APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
AVG-2384 https://security.archlinux.org/AVG-2384
AVG-2385 https://security.archlinux.org/AVG-2385
AVG-2386 https://security.archlinux.org/AVG-2386
AVG-2387 https://security.archlinux.org/AVG-2387
AVG-2388 https://security.archlinux.org/AVG-2388
AVG-2389 https://security.archlinux.org/AVG-2389
CVE-2021-22945 https://nvd.nist.gov/vuln/detail/CVE-2021-22945
dsa-5197 https://www.debian.org/security/2022/dsa-5197
GLSA-202212-01 https://security.gentoo.org/glsa/202212-01
HT213183 https://support.apple.com/kb/HT213183
ntap-20211029-0003 https://security.netapp.com/advisory/ntap-20211029-0003/
RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
USN-5079-1 https://usn.ubuntu.com/5079-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-22945.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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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local

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at http://seclists.org/fulldisclosure/2022/Mar/29
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

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at http://seclists.org/fulldisclosure/2022/Mar/29
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://hackerone.com/reports/1269242
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

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://hackerone.com/reports/1269242
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
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

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
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

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://security.gentoo.org/glsa/202212-01
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

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required

unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://security.gentoo.org/glsa/202212-01
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://security.netapp.com/advisory/ntap-20211029-0003/
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

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://security.netapp.com/advisory/ntap-20211029-0003/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://support.apple.com/kb/HT213183
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://support.apple.com/kb/HT213183
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://www.debian.org/security/2022/dsa-5197
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://www.debian.org/security/2022/dsa-5197
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://www.oracle.com/security-alerts/cpuoct2021.html
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-28T15:53:40Z/ Found at https://www.oracle.com/security-alerts/cpuoct2021.html
Exploit Prediction Scoring System (EPSS)
Percentile 0.57605
EPSS Score 0.00353
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:48:52.913023+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/conan/libcurl/CVE-2021-22945.yml 38.0.0