Cyber Resilience

CVE-2025-47779

Sangoma Certified Asterisk ≤ 18.9

Public PoC
Published
22 May 2025
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS Score 0.0048 39th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2025-47779 is a high-severity Improper Neutralization of Delimiters (CWE-140) vulnerability in Sangoma Certified Asterisk. Its CVSS base score is 7.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Content Injection (T1659); ranked at the 39th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An…

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authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abuse of this security issue allows authenticated attackers to send fake chat messages can be spoofed to appear to come from trusted entities. Even administrators who follow Security best practices and Security Considerations can be impacted. Therefore, abuse can lead to spam and enable social engineering, phishing and similar attacks. Versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk fix the issue.

CWE(s)
CWE-140CWE-792

Related Threats

MITRE ATT&CK Enterprise Techniques

T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-47780Same product: Sangoma Asterisk
CVE-2026-23738Same product: Sangoma Asterisk
CVE-2024-42491Same product: Sangoma Asterisk
CVE-2026-23739Same product: Sangoma Asterisk
CVE-2025-54995Same product: Sangoma Asterisk
CVE-2026-23741Same product: Sangoma Asterisk
CVE-2026-23740Same product: Sangoma Asterisk
CVE-2025-49832Same product: Sangoma Asterisk
CVE-2025-1131Same product: Sangoma Asterisk
CVE-2024-35190Same product: Sangoma Asterisk

Affected Assets

sangoma
asterisk
≤ 18.26.2 · 20.0.0 — 20.14.1 · 21.0.0 — 21.9.1
sangoma
certified asterisk
18.9, 20.7 · ≤ 18.9

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover missing or incorrect delimiter neutralization through targeted test cases.

SI-10 Information Input Validation good match

Input validation directly enforces neutralization of delimiters before they reach parsers or interpreters.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles include explicit requirements for proper delimiter handling and sanitization.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require proper delimiter neutralization during input handling and output encoding.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development and acceptance can detect delimiter-related weaknesses before deployment.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle incorporates practices that reduce the likelihood of delimiter-neutralization defects.

A.8.26 Application security requirements partial match
prevents

Application security requirements include input validation and output encoding that mitigate delimiter mishandling.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage defensive input handling but do not prescribe the specific filtering mechanism.

A.8.28 Secure coding partial match
prevents

Secure coding explicitly requires proper neutralization of delimiters to prevent injection and parsing flaws.

A.8.12 Data leakage prevention none match
none

Data leakage prevention may catch some downstream effects of unfiltered data but does not address the root filtering weakness.

References