What is CVE-2021-33056?

CVE-2021-33056 is a high-severity vulnerability in Linphone Belle-Sip, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2021-08-12.

How severe is CVE-2021-33056?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Linphone Belle-Sip

CVE-2021-33056

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.

Vulnerability class: HTTP Request Smuggling

EPSS: 0.013 (67.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linphone Belle-sip
N/a — versions n/a

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_CONFIRM, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33056?: CVE-2021-33056 is a high-severity vulnerability in Linphone Belle-Sip, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2021-08-12.
How severe is CVE-2021-33056?: High severity. CVSS v3 base score is 7.5 out of 10.