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Vulnerability details: VCID-pzhv-dhbt-aaan
Vulnerability ID VCID-pzhv-dhbt-aaan
Aliases CVE-2023-27538
Summary An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Status Published
Exploitability 0.5
Weighted Severity 6.9
Risk 3.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-287 Improper Authentication
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-305 Authentication Bypass by Primary Weakness
System Score Found at
cvssv3 5.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27538.json
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.0017 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 0.00331 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2023-27538
cvssv3.1 Low https://curl.se/docs/CVE-2023-27538.html
cvssv3.1 5.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 7.7 https://hackerone.com/reports/1898475
ssvc Track https://hackerone.com/reports/1898475
cvssv3.1 7.7 https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
cvssv3 5.5 https://nvd.nist.gov/vuln/detail/CVE-2023-27538
cvssv3.1 5.5 https://nvd.nist.gov/vuln/detail/CVE-2023-27538
cvssv3.1 7.7 https://security.gentoo.org/glsa/202310-12
ssvc Track https://security.gentoo.org/glsa/202310-12
cvssv3.1 7.7 https://security.netapp.com/advisory/ntap-20230420-0010/
ssvc Track https://security.netapp.com/advisory/ntap-20230420-0010/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27538.json
https://api.first.org/data/v1/epss?cve=CVE-2023-27538
https://curl.se/docs/CVE-2023-27538.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27538
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://hackerone.com/reports/1898475
https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
https://security.netapp.com/advisory/ntap-20230420-0010/
2179103 https://bugzilla.redhat.com/show_bug.cgi?id=2179103
cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*
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:-:*:*:*:*:*:*:*
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:36:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
CVE-2023-27538 https://nvd.nist.gov/vuln/detail/CVE-2023-27538
GLSA-202310-12 https://security.gentoo.org/glsa/202310-12
RHSA-2023:6679 https://access.redhat.com/errata/RHSA-2023:6679
USN-5964-1 https://usn.ubuntu.com/5964-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27538.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:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://hackerone.com/reports/1898475
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:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/ Found at https://hackerone.com/reports/1898475
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2023/04/msg00025.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:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/ Found at https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-27538
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:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-27538
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:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://security.gentoo.org/glsa/202310-12
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:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/ Found at https://security.gentoo.org/glsa/202310-12
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://security.netapp.com/advisory/ntap-20230420-0010/
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:N/T:P/P:M/B:A/M:M/D:T/2025-06-09T14:52:04Z/ Found at https://security.netapp.com/advisory/ntap-20230420-0010/
Exploit Prediction Scoring System (EPSS)
Percentile 0.16884
EPSS Score 0.00045
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.