Vulnerability Database

327,594

Total vulnerabilities in the database

CVE-2023-37457

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

  • Published: Dec 14, 2023
  • Updated: Nov 16, 2025
  • CVE: CVE-2023-37457
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
sangoma / certified_asterisk 18.9-cert2 18.9-cert2.x
sangoma / certified_asterisk 18.9-cert1 18.9-cert1.x
sangoma / certified_asterisk 18.9-cert3 18.9-cert3.x
sangoma / certified_asterisk 18.9-cert4 18.9-cert4.x
sangoma / certified_asterisk 18.9-cert5 18.9-cert5.x
sangoma / certified_asterisk 13.13.0 13.13.0.x
sangoma / certified_asterisk 13.13.0-cert1 13.13.0-cert1.x
sangoma / certified_asterisk 13.13.0-cert1-rc1 13.13.0-cert1-rc1.x
sangoma / certified_asterisk 13.13.0-cert1-rc2 13.13.0-cert1-rc2.x
sangoma / certified_asterisk 13.13.0-cert1-rc3 13.13.0-cert1-rc3.x
sangoma / certified_asterisk 13.13.0-cert1-rc4 13.13.0-cert1-rc4.x
sangoma / certified_asterisk 13.13.0-cert2 13.13.0-cert2.x
sangoma / certified_asterisk 13.13.0-cert3 13.13.0-cert3.x
sangoma / certified_asterisk 13.13.0-rc1 13.13.0-rc1.x
sangoma / certified_asterisk 13.13.0-rc2 13.13.0-rc2.x
sangoma / certified_asterisk 16.8.0 16.8.0.x
sangoma / certified_asterisk 16.8.0-cert1 16.8.0-cert1.x
sangoma / certified_asterisk 16.8.0-cert10 16.8.0-cert10.x
sangoma / certified_asterisk 16.8.0-cert11 16.8.0-cert11.x
sangoma / certified_asterisk 16.8.0-cert12 16.8.0-cert12.x
sangoma / certified_asterisk 16.8.0-cert2 16.8.0-cert2.x
sangoma / certified_asterisk 16.8.0-cert3 16.8.0-cert3.x
sangoma / certified_asterisk 16.8.0-cert4 16.8.0-cert4.x
sangoma / certified_asterisk 16.8.0-cert5 16.8.0-cert5.x
sangoma / certified_asterisk 16.8.0-cert6 16.8.0-cert6.x
sangoma / certified_asterisk 16.8.0-cert7 16.8.0-cert7.x
sangoma / certified_asterisk 16.8.0-cert8 16.8.0-cert8.x
sangoma / certified_asterisk 16.8.0-cert9 16.8.0-cert9.x
digium / asterisk 21.0.0 21.0.0.x
digium / asterisk 19.0.0 20.5.0.x
digium / asterisk - 18.20.0.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.