What’s Vulnerable › Vulnerabilities

CVE-2021-43611

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-12 · updated 2026-06-17
• Weakness: CWE-404

Description

Belledonne Belle-sip before 5.0.20 can crash applications such as Linphone via " \ " in the display name of a From header.

Affected products

• Linphone Belle-Sip: before 5.0.20 — fixed in 5.0.20

How to fix

Upgrade to a fixed version: Linphone Belle-Sip 5.0.20. Check the vendor advisory for mitigations.

References

• https://github.com/BelledonneCommunications/belle-sip/commit/d3f0651531e45e91c2e60f3a16a8b612802e5d2d
• https://github.com/BelledonneCommunications/belle-sip/compare/5.0.18...5.0.20
• https://github.com/BelledonneCommunications/belle-sip/commit/d3f0651531e45e91c2e60f3a16a8b612802e5d2d
• https://github.com/BelledonneCommunications/belle-sip/compare/5.0.18...5.0.20

Get alerted when CVE-2021-43611 or the next vulnerability affects your stack