CVE-2008-6576: Unspecified vulnerability in the "session limitation technique" in the FTP service on Nortel Communications Se

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HIGH 7.8MITIGATE

CVE-2008-6576 is a high-severity flaw (CVSS 7.8) affecting cs1000. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in the "session limitation technique" in the FTP service on Nortel Communications Server 1000 (CS1K) 4.50.x, when running on VGMC or signaling nodes, allows remote attackers to cause a denial of service (resource exhaustion and failed updates) via unknown vectors that causes consumption of all available sessions.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Published	2009-04-01
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

2009-04-01 22:30 UTCPublished CVE record published
2026-06-16 23:02 UTCUpdated Record last modified

nortel cs1000 MITIGATE

Affected: 4.50

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.50

Firmware

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

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-2008-6576?

cs1000: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-6576 being exploited?

CVE-2008-6576 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-2008-6576 affect?

CVE-2008-6576 affects cs1000. Severity is high (CVSS 7.8). Unspecified vulnerability in the "session limitation technique" in the FTP service on Nortel Communications Server 1000 (CS1K) 4.50.x, when running on VGMC or signaling nodes, allows remote attackers to cause a denial of service (resource e

How urgent is CVE-2008-6576?

Priority 47/100. High severity

Related CVEs

CVE-2008-6579 MEDIUM 5.0 MITIGATE Nortel Communication Server 1000 4.50.x allows remote attackers to obtain Web application structure via unknow
CVE-2008-6578 HIGH 10.0 MITIGATE Multiple unspecified vulnerabilities in Nortel Communication Server 1000 4.50.x allow remote attackers to exec
CVE-2008-6577 HIGH 10.0 MITIGATE Nortel MG1000S, Signaling Server, and Call Server on the Communications Server 1000 (CS1K) 4.50.x contain mult

References

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