{"cve":"CVE-2007-5640","nvd":{"published":"2007-10-23T17:46:00.000","modified":"2026-06-16T22:46:33.107","status":"Modified","description":"The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile Voice Client, and other product lines, allow remote attackers to block calls and force re-registration via a resume message to the Signaling Server that has a spoofed source IP address for the phone.  NOTE: the attack is more disruptive if a new spoofed resume message is sent after each re-registration.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://osvdb.org/41772","http://secunia.com/advisories/27234","http://securityreason.com/securityalert/3274","http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641","http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_forced_re-authentication_v1.0.txt"],"products":["nortel:business_communications_manager","nortel:centrex_ip_client_manager","nortel:centrex_ip_element_manager","nortel:meridian_option_11c","nortel:meridian_option_51c","nortel:meridian_option_61c","nortel:meridian_option_81c","nortel:meridian_sl100","nortel:mobile_voice_client_2050"],"source":"nvd","synced_at":"2026-10-19T19:48:28.501292361+00:00"},"epss":{"cve":"CVE-2007-5640","score":0.01819,"percentile":0.78731,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}