CVE-2021-33056 describes a denial-of-service vulnerability in Belledonne Belle-sip versions prior to 4.5.20, impacting products like Linphone. An attacker can trigger a crash by sending a crafted SIP message containing an invalid From header. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity that can lead to a complete loss of availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, suggesting awareness within the security community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.5.20CPE matchmatch criteria | cpe:2.3:a:linphone:belle-sip:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.