CVE-2021-43610
Belledonne Belle-sip before 5.0.20 can crash applications such as Linphone via an invalid From header (request URI without a parameter) in an unauthenticated SIP message, a different issue than CVE-2021-33056.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Belledonne Belle-sip before 5.0.20 can crash applications such as Linphone via an invalid From header (request URI without a parameter) in an unauthenticated SIP message, a different issue than 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
- EPSS
- 1.19% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- linphone/belle-sip
- Source
- cve@mitre.org
EPSS 1.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/BelledonneCommunications/belle-sip/commit/d3f0651531e45e91c2e60f3a16a8b612802e5d2dPatch, Third Party Advisory
- https://github.com/BelledonneCommunications/belle-sip/compare/5.0.18...5.0.20Patch, Third Party Advisory
- https://github.com/BelledonneCommunications/belle-sip/commit/d3f0651531e45e91c2e60f3a16a8b612802e5d2dPatch, Third Party Advisory
- https://github.com/BelledonneCommunications/belle-sip/compare/5.0.18...5.0.20Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.