What’s Vulnerable › Vulnerabilities

CVE-2023-28320

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-05-26 · updated 2026-10-23
• Weakness: CWE-400

Description

A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.

Affected products

• Apple macOS: from 11.0 before 11.7.9; from 12.0 before 12.6.8; from 13.0 before 13.5 — fixed in 11.7.9, 12.6.8, 13.5
• curl: before 8.1.0 — fixed in 8.1.0
• Clustered Data ONTAP: all versions
• NetApp H300S Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700S Firmware: all versions
• NetApp Ontap Antivirus Connector: all versions

How to fix

Upgrade to a fixed version: Apple macOS 11.7.9, 12.6.8, 13.5; curl 8.1.0. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2023/Jul/47
• http://seclists.org/fulldisclosure/2023/Jul/48
• http://seclists.org/fulldisclosure/2023/Jul/52
• https://hackerone.com/reports/1929597
• https://security.gentoo.org/glsa/202310-12
• https://security.netapp.com/advisory/ntap-20230609-0009/
• https://support.apple.com/kb/HT213843
• https://support.apple.com/kb/HT213844
• https://support.apple.com/kb/HT213845
• http://seclists.org/fulldisclosure/2023/Jul/47
• http://seclists.org/fulldisclosure/2023/Jul/48
• http://seclists.org/fulldisclosure/2023/Jul/52

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