How severe is CVE-2007-1820?

CVE-2007-1820 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2007-1820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-1820?

CVE-2007-1820 primarily affects Nortel Callpilot. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-1820?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2007-1820 published?

CVE-2007-1820 was published on 2007-04-02 and last updated on 2026-06-16.

CVE-2007-1820

CVE-2007-1820 is a critical-severity vulnerability in Nortel Callpilot with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Nortel Callpilot
Published: 2007-04-02
Last modified: 2026-06-16

Description

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).

Frequently asked questions

What is 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).
How severe is CVE-2007-1820?: CVE-2007-1820 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2007-1820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-1820?: CVE-2007-1820 primarily affects Nortel Callpilot. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-1820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2007-1820 published?: CVE-2007-1820 was published on 2007-04-02 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:nortel:callpilot:*:*:*:*:*:*:*:*
cpe:2.3:a:nortel:meridian_mail:*:*:*:*:*:*:*:*

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