CVE-2008-6577: Nortel MG1000S, Signaling Server, and Call Server on the Communications Server 1000 (CS1K) 4.50.x contain mult

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HIGH 10.0MITIGATE

CVE-2008-6577 is a high-severity flaw (CVSS 10.0) affecting cs1000. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nortel MG1000S, Signaling Server, and Call Server on the Communications Server 1000 (CS1K) 4.50.x contain multiple unspecified hard-coded accounts and passwords, which allows remote attackers to gain privileges.

Why this priority

Critical severity

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	2.6% (top 14%)
CISA exploited list	No
Weakness	CWE-255
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-2008-6577?

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

Is CVE-2008-6577 being exploited?

CVE-2008-6577 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-2008-6577 affect?

CVE-2008-6577 affects cs1000. Severity is high (CVSS 10.0). Nortel MG1000S, Signaling Server, and Call Server on the Communications Server 1000 (CS1K) 4.50.x contain multiple unspecified hard-coded accounts and passwords, which allows remote attackers to gain privileges.

How urgent is CVE-2008-6577?

Priority 56/100. Critical 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-2008-6576 HIGH 7.8 MITIGATE Unspecified vulnerability in the "session limitation technique" in the FTP service on Nortel Communications Se

References

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