How severe is CVE-2007-5639?

CVE-2007-5639 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2007-5639 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-2007-5639?

CVE-2007-5639 primarily affects Nortel Ip Softphone 2050. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-5639?

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-2007-5639 published?

CVE-2007-5639 was published on 2007-10-23 and last updated on 2026-06-16.

CVE-2007-5639

CVE-2007-5639 is a high-severity vulnerability in Nortel Ip Softphone 2050 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 Ip Softphone 2050
Published: 2007-10-23
Last modified: 2026-06-16

Description

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and other Nortel IP Phone, Mobile Voice Client, and WLAN Handsets products allow remote attackers to cause a denial of service (device hang) via a flood of Mute and UnMute messages that have a spoofed source IP address for the Signaling Server.

Frequently asked questions

What is CVE-2007-5639?: The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and other Nortel IP Phone, Mobile Voice Client, and WLAN Handsets products allow remote attackers to cause a denial of service (device hang) via a flood of Mute and UnMute messages that have a spoofed source IP address for the Signaling Server.
How severe is CVE-2007-5639?: CVE-2007-5639 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2007-5639 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-2007-5639?: CVE-2007-5639 primarily affects Nortel Ip Softphone 2050. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-5639?: 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-2007-5639 published?: CVE-2007-5639 was published on 2007-10-23 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:nortel:ip_softphone_2050:*:*:*:*:*:*:*:*
cpe:2.3:a:nortel:mobile_voice_client_2050:*:*:*:*:*:*:*:*

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