Nortel SIP Multimedia PC Client 4.x MCS5100 and MCS5200 does not limit the number of concurrent sessions, which allows attackers to cause a denial of service (resource consumption) via a large number of sessions.
Conclusion & alert: CVE-2008-3157 is rated Moderate Risk (45.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.77%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-03-17 | 0.73% | 0.77% | +0.03% |
| 2 | 2025-02-28 | 0.76% | 0.73% | -0.02% |
| 3 | 2024-12-17 | — | 0.76% | — |
Full EPSS history (5 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| nortel | sip_multimedia_pc_client | 4.0 | cpe:2.3:a:nortel:sip_multimedia_pc_client:4.0:*:mcs5100:*:*:*:*:* |
| nortel | sip_multimedia_pc_client | 4.0 | cpe:2.3:a:nortel:sip_multimedia_pc_client:4.0:*:mcs5200:*:*:*:*:* |