Vulnerability · Published Aug 12, 2021 · Assigned by mitre
CVE-2021-33056
High 7.5
In plain English
A high-severity security flaw in the belle-sip package (Ubuntu). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities).
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.3%top 29.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Belledonne Belle-sip before 4.5.20, as used in Linphone and other products, can crash via an invalid From header in a SIP message.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | belle-sip | no fix listed | UBUNTU-CVE-2021-33056 |
| Ubuntu:24.04:LTS | belle-sip | no fix listed | UBUNTU-CVE-2021-33056 |
| Ubuntu:25.10 | belle-sip | no fix listed | UBUNTU-CVE-2021-33056 |
| Ubuntu:26.04:LTS | belle-sip | no fix listed | UBUNTU-CVE-2021-33056 |
| Ubuntu:26.10 | belle-sip | no fix listed | UBUNTU-CVE-2021-33056 |