CVE-2007-5640
CVE-2007-5640 is a high-severity vulnerability in Nortel Business Communications Manager with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 2.0 base score 7.1)
- EPSS exploit prediction: 2% (76th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Nortel Business Communications Manager
- Published:
- Last 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.
Frequently asked questions
- What is CVE-2007-5640?
- 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.
- How severe is CVE-2007-5640?
- CVE-2007-5640 has a CVSS 2.0 base score of 7.1, rated high severity.
- Is CVE-2007-5640 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2007-5640?
- CVE-2007-5640 primarily affects Nortel Business Communications Manager. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2007-5640?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2007-5640 published?
- CVE-2007-5640 was published on 2007-10-23 and last updated on 2026-06-16.
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
- http://www.securityfocus.com/archive/1/482481/100/0/threaded
- http://www.securityfocus.com/bid/26124
- https://exchange.xforce.ibmcloud.com/vulnerabilities/37254
Affected products (16)
- cpe:2.3:a:nortel:business_communications_manager:50:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:50a:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:50e:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:200:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:400:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:1000:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:srg50:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:business_communications_manager:srg200:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:centrex_ip_client_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:centrex_ip_element_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:meridian_option_11c:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:meridian_option_51c:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:meridian_option_61c:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:meridian_option_81c:*:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:meridian_sl100:cs2100:*:*:*:*:*:*:*
- cpe:2.3:a:nortel:mobile_voice_client_2050:*:*:*:*:*:*:*:*
More vulnerabilities in Nortel Business Communications Manager
- CVE-2004-0056 — High (CVSS 7.5): Multiple vulnerabilities in the H.323 protocol implementation for Nortel Networks Business Communications Manager…
- CVE-2005-0356 — Medium (CVSS 5.0): Multiple TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled…
- CVE-2007-5638 — Medium (CVSS 4.3): The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business…
- CVE-2007-5637 — Medium (CVSS 4.3): The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business…