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Vulnerability details: VCID-4pf4-v4rs-j7bq
Vulnerability ID VCID-4pf4-v4rs-j7bq
Aliases CVE-2023-27537
Summary A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.
Status Published
Exploitability 0.5
Weighted Severity 5.3
Risk 2.6
Affected and Fixed Packages Package Details
Weaknesses (3)
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
System Score Found at
cvssv3 5.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27537.json
epss 0.00027 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00027 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00027 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
epss 0.00105 https://api.first.org/data/v1/epss?cve=CVE-2023-27537
cvssv3.1 Low https://curl.se/docs/CVE-2023-27537.html
cvssv3.1 5.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2023-27537
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27537.json
https://api.first.org/data/v1/epss?cve=CVE-2023-27537
https://curl.se/docs/CVE-2023-27537.html
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://hackerone.com/reports/1897203
2179097 https://bugzilla.redhat.com/show_bug.cgi?id=2179097
cpe:2.3:a:haxx:libcurl:7.88.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:libcurl:7.88.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.88.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:libcurl:7.88.1:*:*:*:*:*:*:*
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:clustered_data_ontap:9.0:-:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:clustered_data_ontap:9.0:-:*:*:*:*:*:*
cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*
cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:*
CVE-2023-27537 https://nvd.nist.gov/vuln/detail/CVE-2023-27537
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27537.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:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/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: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-27537
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 0.05942
EPSS Score 0.00027
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:38:21.776001+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.15/main.json 37.0.0