CVE-2008-4999: Nortel Networks UNIStim IP Phone 0604DAS allows remote attackers to cause a denial of service (crash) via a lo

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HIGH 7.8MITIGATE

CVE-2008-4999 is a high-severity flaw (CVSS 7.8) affecting unistim ip phone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nortel Networks UNIStim IP Phone 0604DAS allows remote attackers to cause a denial of service (crash) via a long ping packet ("ping of death"). NOTE: this issue could not be reproduced by a third party, who tested it on 0604DAD. In addition, the original researcher was not able to reliably reproduce the issue.

Why this priority

High severity
EPSS top 10%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-20
Published	2008-11-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nortel

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2008-11-07 19:36 UTCPublished CVE record published
2026-06-16 22:58 UTCUpdated Record last modified

nortel unistim ip phone MITIGATE

Affected: 0604das

Fixed in: no fixed release known

Safe to downgrade to: a release before 0604das

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Nortel UNIStim IP Phone - Remote Ping Denial of Service

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2008-4999?

unistim ip phone: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-4999 being exploited?

CVE-2008-4999 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2008-4999 affect?

CVE-2008-4999 affects unistim ip phone. Severity is high (CVSS 7.8). Nortel Networks UNIStim IP Phone 0604DAS allows remote attackers to cause a denial of service (crash) via a long ping packet ("ping of death"). NOTE: this issue could not be reproduced by a third party, who tested it on 0604DAD. In additio

How urgent is CVE-2008-4999?

Priority 55/100. High severity; EPSS top 10%: very likely to be exploited; Public exploit reference

References

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