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CVE-2006-5553

21
FAUCET Score

CVE-2006-5553 describes a denial-of-service vulnerability in Cisco Security Agent (CSA) for Linux versions 4.5 prior to 4.5.1.657 and 5.0 prior to 5.0.0.193, specifically when used with Cisco Unified CallManager (CUCM) and Unified Presence Server (CUPS). Remote attackers can exploit this by conducting a port scan with specific options, leading to resource exhaustion. The vulnerability has a CVSS score of 7.8, indicating high severity. It is easily exploitable over the network with low attack complexity, requiring no authentication, and results in a complete denial of service. There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. The vulnerability has received minimal community discussion and media coverage, suggesting it is not widely recognized or actively targeted.

Impacted Technologies

VendorProductVersion(s)CPE
4.5CPE matchmatch criteria
cpe:2.3:a:cisco:security_agent:4.5:*:*:*:*:*:*:*
4.5.1CPE matchmatch criteria
cpe:2.3:a:cisco:security_agent:4.5.1:*:*:*:*:*:*:*
4.5.1.639CPE matchmatch criteria
cpe:2.3:a:cisco:security_agent:4.5.1.639:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:a:cisco:security_agent:5.0:*:*:*:*:*:*:*
5.0\(1\)CPE matchmatch criteria
cpe:2.3:a:cisco:unified_callmanager:5.0\(1\):*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.09%
Probability of exploitation in next 30 days
EPSS Percentile
86.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0309 is in the 76th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

secunia.com / advisories/22574
securitytracker.com / id
exchange.xforce.ibmcloud.com / vulnerabilities/29829
cisco.com / en/US/products/products_security_advisory09186a00807693c7.shtml
PatchVendor Advisory
osvdb.org / 30055
securityfocus.com / bid/20737
Patch
vupen.com / english/advisories/2006/4198