CVE-2023-27536
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
- SSVC decision
- ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 1.75% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 77.5% of scored records. A rank, not a probability.
- NVD base score
- 5.9 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-23.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2023-03-30 00:00Z3 YR AGO
- Last updated
- 2026-10-14 22:46Z14 DAYS AGO
- Reserved
- 2023-03-02
- Assigning CNA
- hackerone
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.9)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- Data version
- 5.2
- Document digest
- edaa4a4434302f97eae1aaf327ca33fa3e0e4bbe21ec6012379fa3132e1abd71
05 Affected products
06 References
- hackerone.comhttps://hackerone.com/reports/1895135
- lists.fedoraproject.orgFEDORA-2023-7e7414e64dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20230420-0010/
- lists.debian.org[debian-lts-announce] 20230421 [SECURITY] [DLA 3398-1] curl security updatehttps://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
- security.gentoo.orgGLSA-202310-12https://security.gentoo.org/glsa/202310-12
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-806742.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-943925.html
07 Fixed in
AlmaLinux 8
- curl Fixed in 7.61.1-30.el8_8.3
- libcurl Fixed in 7.61.1-30.el8_8.3
- libcurl-devel Fixed in 7.61.1-30.el8_8.3
- libcurl-minimal Fixed in 7.61.1-30.el8_8.3
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- curl Fixed in 7.76.1-26.el9
- curl-minimal Fixed in 7.76.1-26.el9
- libcurl Fixed in 7.76.1-26.el9
- libcurl-devel Fixed in 7.76.1-26.el9
- libcurl-minimal Fixed in 7.76.1-26.el9
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- curl Fixed in 7.61.1-30.el8_8.3
- libcurl Fixed in 7.61.1-30.el8_8.3
- libcurl-devel Fixed in 7.61.1-30.el8_8.3
- libcurl-minimal Fixed in 7.61.1-30.el8_8.3
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- curl Fixed in 7.76.1-26.el9
- curl-minimal Fixed in 7.76.1-26.el9
- libcurl Fixed in 7.76.1-26.el9
- libcurl-devel Fixed in 7.76.1-26.el9
- libcurl-minimal Fixed in 7.76.1-26.el9
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- curl Fixed in 7.88.1-7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- curl Fixed in 7.88.1-7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- curl Fixed in 7.88.1-7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- curl Fixed in 7.58.0-2ubuntu3.24
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- curl Fixed in 7.68.0-1ubuntu2.18
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- curl Fixed in 7.81.0-1ubuntu1.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- curl Fixed in 7.35.0-1ubuntu2.20+esm15Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- curl Fixed in 7.47.0-1ubuntu2.19+esm8Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.