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CVE-2021-33056

Belledonne Belle-sip before 4.5.20, as used in Linphone and other products, can crash via an...

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.29%Up 0.7 points since Aug 13, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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.

Record
CVE-2021-33056
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-444
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2021-33056
Updated
2026-11-02
EUVDEUVD-2021-19771 No score

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.

Record
EUVD-2021-19771
Updated
2026-11-03
GitHub AdvisoriesGHSA-jw78-2435-w3r6 No score

Belledonne Belle-sip before 4.5.20, as used in Linphone and other products, can crash via an...

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.

Record
GHSA-jw78-2435-w3r6
Weakness
CWE-444
Updated
2026-11-02
OSV 7.5

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.

Record
CVE-2021-33056
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-33056 7.5

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.

Record
UBUNTU-CVE-2021-33056
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
belle-sip
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.4.1-11.4.1-1.1
 None known
belle-sip
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.4.1-1.11.6.3-2
 None known
belle-sip
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.6.3-5
 None known
belle-sip
Ubuntu:22.04:LTS
 All versions, plus listed versions
4.4.21+dfsg-1
 None known
belle-sip
Ubuntu:24.04:LTS
 All versions, plus listed versions
5.2.0+dfsg-35.2.0+dfsg-3.1build15.2.0+dfsg-3.1build25.2.0+dfsg-3.1build3
 None known
belle-sip
Ubuntu:25.10
 All versions, plus listed versions
5.3.105+dfsg-4
 None known
belle-sip
Ubuntu:26.10
 All versions, plus listed versions
5.3.105+dfsg-4.1
 None known
belle-sip
Ubuntu:26.04:LTS
 All versions, plus listed versions
5.3.105+dfsg-45.3.105+dfsg-4.1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-33056 is a high vulnerability (CVSS 7.5) in Linphone Belle-sip, published August 12, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.29%, the 70th percentile. No source names a fixed version.

References

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