CVE-2006-5277

Off-by-one error in the Certificate Trust List (CTL) Provider service (CTLProvider.exe) in Cisco Unified Communications Manager (CUCM, formerly CallManager) before 20070711 allow remote attackers to execute arbitrary code via a crafted packet that triggers a heap-based buffer overflow.

Published: 2007-07-15 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-5277 is rated High Risk (74.3/100): CVSS Critical severity, with high exploitation likelihood (EPSS 9.57%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.90% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2006-5277

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.67% 9.57% +3.90%
2 2026-03-03 5.46% 5.67% +0.21%
3 2025-03-30 — 5.46% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-5277

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2006-5277

Affected software / configurations for CVE-2006-5277

Vendor Product Version Raw CPE
cisco unified_callmanager >= 3.3, <= 3.3\(5\)sr2 cpe:2.3:a:cisco:unified_callmanager:*:*:*:*:*:*:*:*
cisco unified_callmanager >= 4.1, <= 4.1\(3\)sr4 cpe:2.3:a:cisco:unified_callmanager:*:*:*:*:*:*:*:*
cisco unified_callmanager >= 4.2, <= 4.2\(3\)sr1 cpe:2.3:a:cisco:unified_callmanager:*:*:*:*:*:*:*:*
cisco unified_callmanager 5.0 cpe:2.3:a:cisco:unified_callmanager:5.0:*:*:*:*:*:*:*
cisco unified_communications_manager >= 4.3, <= 4.3\(1\) cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:*:*:*:*
cisco unified_communications_manager >= 5.1, <= 5.1\(1\) cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:*:*:*:*

References for CVE-2006-5277

cvelogic Threat Intelligence