CVE-2007-1820

Nortel Networks CallPilot and Meridian Mail voicemail systems, when a mailbox has auto logon enabled, allow remote attackers to retrieve or remove messages, or reconfigure the mailbox, by spoofing Calling Number Identification (CNID, aka Caller ID).

Published: 2007-04-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-1820 is rated Moderate Risk (63.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.00%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2007-1820

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 2026-06-15 2.86% 2.00% -0.86%
2 2025-11-19 2.75% 2.86% +0.11%
3 2025-08-31 — 2.75% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-1820

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2007-1820

NVD evaluator notes for CVE-2007-1820

Impact: Access complexity set to Medium because Nortel Networks voicemail systems do not hard code or default to this behavior.

Affected software / configurations for CVE-2007-1820

Vendor Product Version Raw CPE
nortel callpilot — cpe:2.3:a:nortel:callpilot:*:*:*:*:*:*:*:*
nortel meridian_mail — cpe:2.3:a:nortel:meridian_mail:*:*:*:*:*:*:*:*

References for CVE-2007-1820

cvelogic Threat Intelligence