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CVE-2003-0556

20
FAUCET Score

CVE-2003-0556 describes a denial-of-service vulnerability affecting Polycom MGC 25, MGC-100, and MGC-50 devices. Remote attackers can crash these systems by sending a high volume of "user" requests to control port 5003. This vulnerability has a CVSS score of 5.0, indicating a network-based attack with low complexity and potential for partial availability impact. While there is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, the CVE has garnered significant community discussion, with 12 mentions across platforms like GitHub and Mastodon.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:h:polycom:mgc-100:*:*:*:*:*:*:*:*
5.51.21CPE matchmatch criteria
cpe:2.3:h:polycom:mgc-25:5.51.21:*:*:*:*:*:*:*
5.51.211CPE matchmatch criteria
cpe:2.3:h:polycom:mgc-25:5.51.211:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:h:polycom:mgc-50:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 45th percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

lists.grok.org.uk / pipermail/full-disclosure/2003-July/006494.html
marc.info