CVE-2008-5871: Nortel Multimedia Communication Server (MSC) 5100 3.0.13 does not verify credentials during call placement, wh

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MEDIUM 6.4DOWNGRADE

CVE-2008-5871 is a medium-severity flaw (CVSS 6.4) affecting multimedia communication server 5100. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nortel Multimedia Communication Server (MSC) 5100 3.0.13 does not verify credentials during call placement, which allows remote attackers to spoof and redirect VoIP calls, possibly related to the snoop command.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-255
Published	2009-01-08
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

2009-01-08 18:30 UTCPublished CVE record published
2026-06-16 23:01 UTCUpdated Record last modified

nortel multimedia communication server 5100 DOWNGRADE

Affected: 3.0.13

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.13

1. Check installed version

apt-cache policy multimedia-communication-server-5100 || rpm -q multimedia-communication-server-5100 || multimedia-communication-server-5100 --version

2. No fixed release: DOWNGRADE to a release before 3.0.13 (Debian / Ubuntu)

apt-cache madison multimedia-communication-server-5100 sudo apt install multimedia-communication-server-5100=<VERSION_BEFORE_3.0.13> sudo apt-mark hold multimedia-communication-server-5100

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list multimedia-communication-server-5100 sudo dnf downgrade multimedia-communication-server-5100-<VERSION_BEFORE_3.0.13> sudo dnf versionlock add multimedia-communication-server-5100

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2008-5871?

multimedia communication server 5100: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-5871 being exploited?

CVE-2008-5871 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-2008-5871 affect?

CVE-2008-5871 affects multimedia communication server 5100. Severity is medium (CVSS 6.4). Nortel Multimedia Communication Server (MSC) 5100 3.0.13 does not verify credentials during call placement, which allows remote attackers to spoof and redirect VoIP calls, possibly related to the snoop command.

How urgent is CVE-2008-5871?

Priority 41/100. No elevated risk signals yet.

Related CVEs

CVE-2008-5872 HIGH 7.8 DOWNGRADE Multiple unspecified vulnerabilities in the UNIStim File Transfer Protocol (UFTP) processing in IP Client Mana

References

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