Cyber Resilience

CVE-2021-33056

High

Published: 12 August 2021

Published
12 August 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0042 62.1th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33056 is a high-severity HTTP Request/Response Smuggling (CWE-444) vulnerability in Linphone Belle-Sip. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 37.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-444

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

linphone
belle-sip
≤ 4.5.20

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References