CVE-2023-27538
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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 1.45% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 72.8% of scored records. A rank, not a probability.
- NVD base score
- 5.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- 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
- High (CVSS 7.7)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 3e5f77a3e63224846feb83117206e9c967ede21bd870d6438c5012a6c281fefe
05 Affected products
06 References
- hackerone.comhttps://hackerone.com/reports/1898475
- 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-077170.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-943925.html
07 Fixed in
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 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.
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.