HOMEVULNERABILITIESCVE-2023-27536
MEDIUM

CVE-2023-27536

CWE-305Published: March 30, 2023· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official 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 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.

NVD Source

Technical Analysis

CVE-2023-27536 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
haxx1 product(s)
libcurl
netapp10 product(s)
active iq unified managerh300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh410s firmwareh410sontap
splunk1 product(s)
universal forwarder
Source: NVD CPE · 15 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://hackerone.com/reports/1895135
ADVISORYhttps://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
ADVISORYhttps://security.gentoo.org/glsa/202310-12
ADVISORYhttps://security.netapp.com/advisory/ntap-20230420-0010/
ADVISORYhttps://hackerone.com/reports/1895135
ADVISORYhttps://lists.debian.org/debian-lts-announce/2023/04/msg00025.html
ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
ADVISORYhttps://security.gentoo.org/glsa/202310-12
ADVISORYhttps://security.netapp.com/advisory/ntap-20230420-0010/

All References (10)

→
https://hackerone.com/reports/1895135Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202310-12Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory
→
https://hackerone.com/reports/1895135Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/04/msg00025.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202310-12Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory

Quick Facts

CVE IDCVE-2023-27536
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-305
CISA KEVNo
Affected5 vendor(s)
PublishedMar 30, 2023

Related CVEs (CWE-305)

CVE-2025-24522
10.0
CVE-2020-15787
9.8
CVE-2023-1307
9.8
CVE-2026-30849
9.8
CVE-2025-32011
9.8
CVE-2023-6153
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-27536 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2023-27536·NVD