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01 Record

CVE-2023-28321

An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl

MediumPUBLISHEDCNA: hackerone
CNA base score5.9 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
View raw JSON

02 Description

An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl

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.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.80% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 78.4% 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:N/I:H/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
2023-05-26 00:00Z3 YR AGO
Last updated
2025-01-15 15:54Z1 YR AGO
Reserved
2023-03-14
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:N/I:H/A:N
Weaknesses
  • CWE-295Improper Certificate ValidationBase
Data version
5.1
Document digest
b7353e2fbeadef81af12265d04c7be47e7d06d22e836b3b718d453678f575fb6

05 Affected products

VendorProductVersionsPlatforms
n/ahttps://github.com/curl/curlFixed in 8.1.0—

06 References

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 7.76.1-23.el9_2.2
  • curl-minimal
    Fixed in 7.76.1-23.el9_2.2
  • libcurl
    Fixed in 7.76.1-23.el9_2.2
  • libcurl-devel
    Fixed in 7.76.1-23.el9_2.2
  • libcurl-minimal
    Fixed in 7.76.1-23.el9_2.2

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 7.76.1-23.el9_2.2
  • curl-minimal
    Fixed in 7.76.1-23.el9_2.2
  • libcurl
    Fixed in 7.76.1-23.el9_2.2
  • libcurl-devel
    Fixed in 7.76.1-23.el9_2.2
  • libcurl-minimal
    Fixed in 7.76.1-23.el9_2.2

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 7.88.1-10

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • curl
    Fixed in 7.88.1-10

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • curl
    Fixed in 7.88.1-10

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • curl
    Fixed in 7.68.0-1ubuntu2.19

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 7.81.0-1ubuntu1.11

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+esm16
    Available 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+esm9
    Available 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 18.04 LTS

  • curl
    Fixed in 7.58.0-2ubuntu3.24+esm1
    Available 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.