PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, limited integrity, and limited availability for affected systems. Impacting 4 products from teluu, from asterisk, from sangoma and 1 other, organizations running these solutions should prioritize assessment and patching.
Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2021-12-22T18:15:07.487
2025-11-04T16:15:43.010
Modified
CVSSv3.1: 7.3 (HIGH)
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.6
10.0
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | teluu | pjsip | ≤ 2.11.1 | Yes |
| Application | asterisk | certified_asterisk | < 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | asterisk | certified_asterisk | 16.8.0 | Yes |
| Application | sangoma | asterisk | < 16.24.1 | Yes |
| Application | sangoma | asterisk | < 18.10.1 | Yes |
| Application | sangoma | asterisk | < 19.2.1 | Yes |
| Operating System | debian | debian_linux | 9.0 | Yes |
| Operating System | debian | debian_linux | 10.0 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For teluu's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.