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Vulnerability details: VCID-ms2r-94ph-yyh3
Vulnerability ID VCID-ms2r-94ph-yyh3
Aliases CVE-2023-27536
Summary Improper Authentication An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.
Status Published
Exploitability 0.5
Weighted Severity 5.3
Risk 2.6
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-287 Improper Authentication
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 5.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27536.json
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
epss 0.00011 https://api.first.org/data/v1/epss?cve=CVE-2023-27536
cvssv3.1 Low https://curl.se/docs/CVE-2023-27536.html
cvssv3.1 5.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 5.9 https://hackerone.com/reports/1895135
ssvc Track https://hackerone.com/reports/1895135
cvssv3.1 5.9 https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
cvssv3.1 5.9 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
cvssv3.1 5.9 https://security.gentoo.org/glsa/202310-12
ssvc Track https://security.gentoo.org/glsa/202310-12
cvssv3.1 5.9 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-2023-27536.json
https://api.first.org/data/v1/epss?cve=CVE-2023-27536
https://curl.se/docs/CVE-2023-27536.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27536
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://hackerone.com/reports/1895135
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
2179092 https://bugzilla.redhat.com/show_bug.cgi?id=2179092
36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
CVE-2023-27536 https://nvd.nist.gov/vuln/detail/CVE-2023-27536
GLSA-202310-12 https://security.gentoo.org/glsa/202310-12
msg00025.html https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
ntap-20230420-0010 https://security.netapp.com/advisory/ntap-20230420-0010/
RHSA-2023:4523 https://access.redhat.com/errata/RHSA-2023:4523
RHSA-2023:6679 https://access.redhat.com/errata/RHSA-2023:6679
RHSA-2024:0428 https://access.redhat.com/errata/RHSA-2024:0428
USN-5964-1 https://usn.ubuntu.com/5964-1/
USN-5964-2 https://usn.ubuntu.com/5964-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-27536.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:H/I:N/A:N Found at https://hackerone.com/reports/1895135
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/ Found at https://hackerone.com/reports/1895135
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/ Found at https://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/ Found at https://security.gentoo.org/glsa/202310-12
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-14T15:39:19Z/ Found at https://security.netapp.com/advisory/ntap-20230420-0010/
Exploit Prediction Scoring System (EPSS)
Percentile 0.01285
EPSS Score 0.00011
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:51:04.996385+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/conan/libcurl/CVE-2023-27536.yml 38.0.0