https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-43611.htmlhttps://patchthecve.com/cve/CVE-2021-43611.htmlWed, 17 Jun 2026 04:11:11 +0000HIGH 7.5: Belledonne Belle-sip before 5.0.20 can crash applications such as Linphone via " \ " in the display name of a From header.https://patchthecve.com/cve/CVE-2021-43610.htmlhttps://patchthecve.com/cve/CVE-2021-43610.htmlWed, 17 Jun 2026 04:11:11 +0000HIGH 7.5: 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.https://patchthecve.com/cve/CVE-2021-33056.htmlhttps://patchthecve.com/cve/CVE-2021-33056.htmlWed, 17 Jun 2026 03:54:04 +0000HIGH 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.